Is there an Eppendorf pipette which can be used to pipette 40 % polyethylene glycol 8000 (PEG)?

Yes, for pipetting PEG instruments operating according to the positive displacement principle like the Biomaster or a Multipette/Repeater can be used.

What is the best way to pipette chloroform?

When pipetting chloroform, we recommend positive displacement instruments like Biomaster, Multipette/Repeater, and Varipette or an air cushion pipette (Research plus, Reference 2) in combination with the reverse pipetting technique (see Userguide 20 and 21 for details).

What is the best way to pipette diethyl ether?

Diethyl ether has such a high vapor pressure that it would leak out of the tip immediately when an air cushion pipette is used. For this reason, it can only be pipetted using a positive displacement pipette, such as Biomaster, Multipette/Repeater, and Varipette.

What should be considered when pipetting methanol with air cushion pipettes?

Due to the increased vapor pressure, we recommend that the tip is prewetted at least 3 times and that the reverse pipetting technique is used.

What is the best pipette for pipetting a 99% solution of n-amyl alcohol?

A 99 % solution of n-amyl alcohol is a highly viscous solution. We recommend working with an instrument that operates according to the positive displacement principle like Multipette/Repeater, Varipette, or Biomaster.

What is the best way to dispense organic solvent?

It is best to use a positive displacement device like the Multipette/Repeater. Positive displacement devices are most suitable for precise and drip-free dispensing of liquids with high vapor pressure. As the liquid is enclosed in a tip with integrated piston, the solvent vapor does not come into direct contact with the instrument.

I would like to pipette dichloromethane and n-hexanol very precisely. Can I use air cushion pipettes for this application?

Both dichloromethane and n-hexanol have a very high vapor pressure. For that reason, positive displacement instruments like the Biomaster and the Multipette/Repeater should be used.

How can radioactive contamination be removed from Eppendorf pipettes?

Following contamination of pipettes with radioactive liquids, we recommend placing the contaminated parts in a complex-forming liquid or special cleaning solution. Then rinse very thoroughly with distilled water and dry. Grease piston lightly afterwards.

I often work with different chemicals. Can you tell me when I need to adjust my pipettes?

This belongs to the permissible errors of your specific application. In general an adjustment of air cushion pipettes, in other words altering the stroke of the pipette, is required for solutions of a density higher 1.2 mg/µL. Please be aware that variable manual pipettes turn into "fixed-volume pipettes" when being adjusted: They can only be adjusted to a specific liquid to one volume and not across the entire dispensing range. Eppendorf manual pipettes have a user adjustment for temporary adjustment purposes. This user adjustment can easily be set back to manufacturer settings without the need for recalibration. For the correct procedure and examples for settings of user adjustments for different liquids please see the operating instructions and CD enclosed to your pipette.

How do I determine the volume values when calibrating gravimetrically?

The measuring values of the analysis scales are multiplied by the correction factor Z (see SOP pipettes). This takes into account the density of the water at the relevant temperature and the relevant air.

What does EN ISO 8655 cover?

ISO 8655 addresses the needs of suppliers, test houses, and users and specifies the general requirements for piston-operated liquid handling devices. It is structured in seven chapters: ISO 8655-1: Terminology, general requirements, and user recommendations ISO 8655-2: Piston pipettes ISO 8655-3: Piston burettes ISO 8655-4: Dilutors ISO 8655-5: Dispensers ISO 8655-6: Gravimetric method for the determination of measurement error ISO 8655-7: Non-gravimetric methods for assessment of equipment performance (titration, photometry)

What do the terms random error and systematic error mean in a pipette calibration?

The systematic error describes the deviation of the dispensed volume from the nominal volume or from the selected volume of the piston stroke device, and is determined by establishing the mean value of (usually) 10 measurements. The random error describes the mean variation of the dispensed volumes from the mean value of the dispensed volumes, and is determined by calculating the repeat standard deviation of (usually) 10 measurements.

Why are the Z factors listed in our SOP different from factors which can be derived from density reference values (of water)?

The Z factor is included in EN ISO 8655-6 and was incorporated into our SOP. As we understand it, it was incorporated in the standard by the Physikalisch Technische Bundesanstalt in Braunschweig. The Z factor describes the density of water at a particular temperature using a 5th degree polynomial. Furthermore, the density of water is corrected by the density of air (derived from air pressure) and a fixed correction value for balances. These corrections are the key reasons for the deviation from density values in various books of tables.

At which volumes should a variable pipette be calibrated?

According to the EN ISO 8655 standard, a variable pipette should be calibrated to 3 volumes during conformity testing: 1. Nominal volume, 2. 50 % of nominal volume, 3. Smallest value that can be set or 10 % of nominal volume.

What is the nominal volume of a variable pipette?

The nominal volume of a variable pipette is always the maximum volume. For a 100 - 1,000 µL pipette, it is therefore 1,000 µL.

I very frequently work with different chemicals. Can I still perform pipette calibration using water?

Calibration, i.e. checking a pipette on a balance, is always performed using distilled or deionized water (see EN ISO 8655).

During weighing (pipette calibration) I obtained steadily decreasing measuring results. Why is this?

The weight fluctuations you measured would appear to be a temperature problem. Please ensure that the pipette, the distilled water used for testing, the tips etc. are all at the same temperature. It is recommended that the pipettes be placed in the weighing room at least 2 hours before the test is performed. While measuring, ensure that transfer of heat from your hands is kept to a minimum (otherwise weight fluctuations may occur!) Tip: do not constantly grasp the pipette in the palm of your hand while waiting for each measurement result! We recommend our standard operating procedure (SOP) for pipettes as a source of basic information on pipette calibration.

How are multi-channel pipettes tested?

According to ISO 8655, all channels of multi-channel pipettes are to be tested. All channels have to be filled but only the channel to be tested is measured. Because of the high number of measurements (8-channel pipette: 240 measurements, 12-channel pipette: 360 measurements), it makes sense to send the multi-channel pipette to a professional calibration lab. These labs have special constructions for balances to ensure that all channels are filled but only one channel is measured.

Is the pipette grease free of resins?

Yes, the pipette grease supplied by Eppendorf is free of resins.

How is the wall mount for pipettes attached to the wall?

The pipette holder is affixed to the wall with adhesive.

Is the Research plus resistant to concentrated acids?

In most cases, concentrated acids are not a problem. Please check the chemical resistance information on our homepage before use. Please note that aggressive chemicals used over a longer period of time may shorten the lifetime of the pipette.

In the adjustment manual of the Research plus, only two examples of liquids are given (50 % glycerol and 45 % cesium chloride). Are there more examples of liquids and their recommended setting on the adjustment display that have been tested?

Yes. Please find further information within Application Note 198.

Is a gravimetric test necessary after resetting the adjustment display to "0"?

From a technical point of view, a gravimetric test is not required. However, for certified laboratories a gravimetric test might be required for documentation purposes.

Is the Research plus compatible with hydrofluoric acid?

Yes. Please note that the use of aggressive chemicals like hydrofluoric acid over a longer period of time will reduce the lifetime of the pipette.

How many overnight cycles or total hours of UV irradiation can the Research plus withstand before any discoloration or change of the material will be visible?

We tested UV radiation under very intense conditions for 165 hours. There was no visible discoloration or change to the material.

Can the Research plus be autoclaved if the locking ring is installed to deactivate the spring loading?

Yes. The locking ring is made of PPS (polyphenylene sulfide) and therefore autoclavable (121 °C, 1 bar, 20 min).

Is the Research plus compatible with sodium hydroxide (größer10 %)?

Yes, the Research plus is compatible with sodium hydroxide größer 10 %.

Is the Research plus compatible with 65 % nitric acid?

Yes, in general, however, discoloration may take place and the piston seal may corrode. Please note that the use of aggressive chemicals like nitric acid over a longer period of time will reduce the lifetime of the pipette.

Do I need to disassemble the Research plus before autoclaving?

No. It can be autoclaved in one piece (121 °C, 1 bar, 20 min).

What are the settings of the Research plus pipette for liquids of different viscosities or specific densities?

The user manual of the Research plus mentions specific settings for some volumes of the most common liquid classes. These values are for orientation only as the systematic and random error are affected by many factors like, e.g., the mode of operation, the tip used, temperature. It is essential to check this data according to your own method.

Will water vapor enter the pipette while it is being autoclaved, causing water vapor to bead up on the inside of the numerical volume setting display?

Vapor will penetrate the inside of the pipette during autoclaving but this will not cause damage. We tested our pipettes with 175 autoclaving cycles (121 °C, 1 bar, 20 min). The number of tests chosen corresponds to an average of 5 years of use.

In part 3 of the operating manual of the Research plus, you recommend adjusting the volume setting from a higher value to a lower value. If required, the user should turn the value beyond the required value and then back again. What is the reason for such a recommendation?

For technical reasons, the results are generally more precise when a volume setting is carried out from a higher down to a lower value. This is valid for all manual pipettes.

How should contamination on the outside of the Research plus be removed?

Wet a cloth with water or 70% isopropanol and wipe off.

How should the Research plus be disinfected?

Wipe the outer surface with disinfectant, DNA/RNA decontamination agent, or 70 % isopropanol or a commercially available disinfectant. Check the chemical resistance of the pipettes using the chemical resistance table (website). After the exposure time of the disinfectant, rinse thoroughly with demineralized water. This step is especially important if subsequent decontamination, e.g., with UV-light or autoclaving, should be performed. The Research plus may be temporarily subjected to UV light under a sterile bench. We recommend the use of a Hg-lamp, 254 nm, 30 W. The distance between lamp and pipette should be approx. 60 cm. The Research plus is fully autoclavable.

How can I clean and maintain the Research plus?

The Research plus pipettes are easy to clean. Only the lower part should be cleaned on a regular basis in accordance with the frequency of use. The lower part of the single-channel and multi-channel Research plus pipettes can be removed easily as described in the operating manual of the Research plus or in our Application Note 198.

Which material is the Research plus made of?

Pipette parts which might come in contact with liquids are made of the following materials: PP (polypropylene), PEI (polyetherimide), PVDF (polyvinyliden fluoride), PC (polycarbonate), PPS (polyphenylene sulfide), and stainless steel.

When should the spring loading of the single-channel Research plus pipettes be deactivated?

For dispensing tasks in which a pipette tip is used over a long time or is slightly bent, it can be helpful to deactivate the spring loading of the tip cone by installing the locking ring. This can also be helpful for pipette tips which are not designed for Eppendorf pipette cones.

When pipetting foaming liquids (e.g. cell culture media) I‘m transferring foam which got trapped between the epT.I.PS. 384. How can I improve?

When pipetting foaming liquids it may happen that foam adhere between the tips. Make sure to pipette slowly avoiding foam formation. Importantly, do not immerse the tip too deeply into the liquid preventing foam getting caught between the tips.

What is the difference between factory setting and user adjustment?

The user adjustment for temporarily applications such as pipetting a liquid with a higher density than water. The little window shows the change. It can be set back to factory settings ""0"". A subsequent calibration is not necessary. The factory setting is a basic adjustment of the pipette. It should only be changed if the pipette exceeds the maximum permissible errors after calibration and all other factors which could have an influence have been excluded.

How often should pipettes be calibrated?

The user decides upon the frequency of calibration, the number of test volumes and the number of measurements for each test volume within the framework of monitoring his test materials. This can vary depending on the frequency of use of the pipette, the number of users of the device, the aggressiveness of the liquids to be dispensed and the error limits deemed acceptable by the user. However, an inspection should be carried out at least once a year. See also EN ISO 8655-6.

I have noticed that more solution is used for reverse pipetting than for normal pipetting. What is the reason for this?

Reverse pipetting means uptake of liquid including the blow-out volume and dispensing of liquid without the blow-out volume. Reverse pipetting is recommended to reduce the error with viscous or foaming liquids or when dispensing very small sample volumes. The excess solution aspirated remains in the tip and is discarded.

Can you recommend any literature on reverse pipetting?

Userguides 20 and 21 describe the technique and give application examples. They can be downloaded from the Knowledge Base on our website.

Should the pipette tip be wetted with liquid before pipetting volumes smaller than 10 µL?

Regardless of the volume, the air cushion should be wetted by multiple filling and emptying of the tip before dispensing.

What is the best way to pipette viscous liquids?

When pipetting viscous liquids, we recommend positive displacement instruments like Biomaster, Multipette/Repeater, and Varipette or an air cushion pipette (Research plus, Reference 2) in combination with the reverse pipetting technique (see Userguide 20 and 21 for details).

Are Eppendorf pipettes resistant to acetonitrile?

Yes, Eppendorf pipettes are resistant to acetonitrile but care must be taken to avoid damage to printing and display window.

Are your pipettes free of nucleic acids?

No, we cannot guarantee this. Of course we work carefully and cleanly in production, but no special measures are taken to prevent the infiltration of nucleic acids. To protect your pipette from contamination, we recommend using positive displacement pipettes, for example, our Biomaster or filtertips (ep Dualfilter T.I.P.S. or ep Dualfilter T.I.P.S. SealMax).

Do Eppendorf pipettes always need to be greased?

No, the piston only has to be greased if grease-dissolving solutions like organic solvents have been used.

Can the pipette withstand evacuation (applying a vacuum)?

No, air cushion pipettes should not be used under vacuum, as the pressure ratios are not right.

How should warm or cold liquids be pipetted?

Exactly in the same way as liquids at room temperature, however, please note that solutions may behave differently. In addition, the pipetting accuracy / precision may be outside the permissible error limits. In order to achieve maximum accuracy / precision, all components should have the same temperature: pipette, tips, liquid, and the surrounding air.

Are the handles of Eppendorf pipettes made of a special material to minimize temperature effects during pipetting?

Temperature effects are minimized in our pipettes by their design. We use a special polypropylene which satisfies the special requirements on a pipette handle.

text.skipToContent text.skipToNavigation

HK | HKD

Select your settings

* = required

Select your country/region *

(China) Hong Kong
(China) Taiwan
Afghanistan
Albania
Algeria
Angola
Anguilla
Antigua and Barbuda
Argentina
Armenia
Aruba
Australia
Austria
Azerbaijan
Bahamas
Bahrain
Bangladesh
Barbados
Belgium
Belize
Benin
Bermuda
Bhutan
Bolivia
Bosnia and Herzegovina
Botswana
Brazil
Brunei Darussalam
Bulgaria
Burkina Faso
Burundi
Cambodia
Cameroon
Canada
Cape Verde
Cayman Islands
Central African Republic
Chad
Chile
China
Christmas Island
Cocos (Keeling) Islands
Colombia
Comoros
Congo
Congo, the Democratic Republic of the
Cook Islands
Costa Rica
Cote d'Ivoire
Croatia
Curaçao
Cyprus
Czech Republic
Denmark
Djibouti
Dominica
Dominican Republic
Ecuador
Egypt
El Salvador
Equatorial Guinea
Eritrea
Estonia
Ethiopia
Falkland Islands
Faroe Islands
Fiji
Finland
France
French Guiana
French Polynesia
Gabon
Gambia
Georgia
Germany
Ghana
Gibraltar
Greece
Greenland
Grenada
Guadeloupe
Guatemala
Guernsey
Guinea
Guinea-Bissau
Guyana
Haiti
Honduras
Hungary
Iceland
India
Indonesia
Iraq
Ireland
Isle of Man
Israel
Italy
Jamaica
Japan
Jersey
Jordan
Kazakhstan
Kenya
Kiribati
Korea, Republic of
Kosovo
Kuwait
Kyrgyzstan
Lao People's Democratic Republic
Latvia
Lebanon
Lesotho
Liberia
Libyan Arab Jamahiriya
Liechtenstein
Lithuania
Luxembourg
Macedonia
Madagascar
Malawi
Malaysia
Maldives
Mali
Malta
Marshall Islands
Martinique
Mauritania
Mauritius
Mayotte
Mexico
Micronesia, Federated States of
Moldova
Monaco
Mongolia
Montenegro
Montserrat
Morocco
Mozambique
Myanmar
Namibia
Nauru
Nepal
Netherlands
New Caledonia
New Zealand
Nicaragua
Niger
Nigeria
Niue
Norfolk Island
Norway
Oman
Pakistan
Palau
Palestinian Territory
Panama
Papua New Guinea
Paraguay
Peru
Philippines
Pitcairn
Poland
Portugal
Qatar
Reunion
Romania
Rwanda
Saint Barthélemy
Saint Kitts and Nevis
Saint Lucia
Saint Martin (French part)
Saint Vincent and the Grenadines
Samoa
San Marino
Sao Tome and Principe
Saudi Arabia
Senegal
Serbia
Seychelles
Sierra Leone
Singapore
Sint Maarten (Dutch part)
Slovakia
Slovenia
Solomon Islands
Somalia
South Africa
Spain
Sri Lanka
Suriname
Swaziland
Sweden
Switzerland
Tajikistan
Tanzania
Thailand
Timor-Leste
Togo
Tokelau
Tonga
Trinidad and Tobago
Tunisia
Turkey
Turkmenistan
Turks and Caicos Islands
Tuvalu
Uganda
Ukraine
United Arab Emirates
United Kingdom
United States
Uruguay
Uzbekistan
Vanuatu
Venezuela
Viet Nam
Virgin Islands, British
Wallis and Futuna
Western Sahara
Yemen
Zambia
Zimbabwe

Select your language *

English

Select your currency *

Please be aware that your shopping cart cannot be restored on the newly changed country website or when you come back. If you want to save your cart, please login.

myEppendorf

Quick Order

Quote

Lab Academy
Beyond Science
Service & Support
Company & Careers

Lab Academy
Beyond Science
Service & Support
Company & Careers

HK | HKD

Select your settings

* = required

Select your country/region *

(China) Hong Kong
(China) Taiwan
Afghanistan
Albania
Algeria
Angola
Anguilla
Antigua and Barbuda
Argentina
Armenia
Aruba
Australia
Austria
Azerbaijan
Bahamas
Bahrain
Bangladesh
Barbados
Belgium
Belize
Benin
Bermuda
Bhutan
Bolivia
Bosnia and Herzegovina
Botswana
Brazil
Brunei Darussalam
Bulgaria
Burkina Faso
Burundi
Cambodia
Cameroon
Canada
Cape Verde
Cayman Islands
Central African Republic
Chad
Chile
China
Christmas Island
Cocos (Keeling) Islands
Colombia
Comoros
Congo
Congo, the Democratic Republic of the
Cook Islands
Costa Rica
Cote d'Ivoire
Croatia
Curaçao
Cyprus
Czech Republic
Denmark
Djibouti
Dominica
Dominican Republic
Ecuador
Egypt
El Salvador
Equatorial Guinea
Eritrea
Estonia
Ethiopia
Falkland Islands
Faroe Islands
Fiji
Finland
France
French Guiana
French Polynesia
Gabon
Gambia
Georgia
Germany
Ghana
Gibraltar
Greece
Greenland
Grenada
Guadeloupe
Guatemala
Guernsey
Guinea
Guinea-Bissau
Guyana
Haiti
Honduras
Hungary
Iceland
India
Indonesia
Iraq
Ireland
Isle of Man
Israel
Italy
Jamaica
Japan
Jersey
Jordan
Kazakhstan
Kenya
Kiribati
Korea, Republic of
Kosovo
Kuwait
Kyrgyzstan
Lao People's Democratic Republic
Latvia
Lebanon
Lesotho
Liberia
Libyan Arab Jamahiriya
Liechtenstein
Lithuania
Luxembourg
Macedonia
Madagascar
Malawi
Malaysia
Maldives
Mali
Malta
Marshall Islands
Martinique
Mauritania
Mauritius
Mayotte
Mexico
Micronesia, Federated States of
Moldova
Monaco
Mongolia
Montenegro
Montserrat
Morocco
Mozambique
Myanmar
Namibia
Nauru
Nepal
Netherlands
New Caledonia
New Zealand
Nicaragua
Niger
Nigeria
Niue
Norfolk Island
Norway
Oman
Pakistan
Palau
Palestinian Territory
Panama
Papua New Guinea
Paraguay
Peru
Philippines
Pitcairn
Poland
Portugal
Qatar
Reunion
Romania
Rwanda
Saint Barthélemy
Saint Kitts and Nevis
Saint Lucia
Saint Martin (French part)
Saint Vincent and the Grenadines
Samoa
San Marino
Sao Tome and Principe
Saudi Arabia
Senegal
Serbia
Seychelles
Sierra Leone
Singapore
Sint Maarten (Dutch part)
Slovakia
Slovenia
Solomon Islands
Somalia
South Africa
Spain
Sri Lanka
Suriname
Swaziland
Sweden
Switzerland
Tajikistan
Tanzania
Thailand
Timor-Leste
Togo
Tokelau
Tonga
Trinidad and Tobago
Tunisia
Turkey
Turkmenistan
Turks and Caicos Islands
Tuvalu
Uganda
Ukraine
United Arab Emirates
United Kingdom
United States
Uruguay
Uzbekistan
Vanuatu
Venezuela
Viet Nam
Virgin Islands, British
Wallis and Futuna
Western Sahara
Yemen
Zambia
Zimbabwe

Select your language *

English

Select your currency *

Please be aware that your shopping cart cannot be restored on the newly changed country website or when you come back. If you want to save your cart, please login.

Automated Pipetting
Automated Pipetting
Bioprocess
Bioprocess
Cell Incubation
Cell Incubation
- CO2 Incubators
- Sample and Information Management
Centrifugation
Centrifugation
Cold Storage
Cold Storage
Digital Lab Management
Digital Lab Management
- Sample and Information Management
Laboratory Consumables
Laboratory Consumables
Lab Shakers
Lab Shakers
Liquid Handling
Liquid Handling
PCR
PCR
Photometry
Photometry
Services
Services
Temperature Control and Mixing
Temperature Control and Mixing
- Accessories
- Instruments
Promotions
OEM

myEppendorf

epPoints®
Product Registration
- Register Products
Order History
Redeem Quote
Lists
- Batch Order
My Profile
Deactivate Account

No results found

Search Suggestions

Product Families

Show all Product Families ()

Article

Show all Articles ()

Content

Show all Content ()

Home
Products
Liquid Handling
Manual Pipettes & Dispensers
Eppendorf Research^® plus

Eppendorf Research^® plus - Mechanical Pipette

Eppendorf Research® plus single- and multi-channel mechanical pipettes

4-digit volume display on Eppendorf Research® plus mechanical pipettes

Eppendorf Research® plus manual pipette 4-digit display for easy and precise volume adjustment

Eppendorf Research® plus manual pipettes feature a temporary adjustment option for challenging liquid classes

The Pipette Carousel 2 carries up to six Eppendorf Research® plus pipettes

Eppendorf Research® plus multi-channel pipettes with 8 or 12 tip cones for PCR-strips and 96-well plates

Eppendorf Research® plus multi-channel pipette with 8 tips used to fill a deepwell plate

Eppendorf Research® plus 16 and 24-channel mechanical pipettes and 384-well plate

Fill 384-well plates with ease using Eppendorf multi-channel pipettes with 16 or 24 channels

Eppendorf multi-channel pipettes with 16 or 24 tip cones are ideal to dispense multiple samples in 384-well plates

Eppendorf multi-channel pipette with 24 tips dispensing liquid into agarose gel for gel electrophoresis

Male laboratory technician works at the bench with PCR, Eppendorf ThermoMixer® and dispenses liquid in a plate

Female Scientist using Eppendorf Research® plus Single-Channel Pipette

ACT label of sustainability certification for Eppendorf Research® plus pipette, 100-1000 µL (blue), single-channel, variable

Videos not loading, because cookies have been rejected. Change your

Product Information

The Eppendorf Research plus is one of the safest and most ergonomic mechanical pipettes available. Meeting the highest needs of precision and accuracy while providing high flexibility via a large number of variants, the Research plus will become an indispensable companion in your lab. This micropipette is remarkably light, both in terms of weight and pipetting forces, which helps you to avoid hand and arm strain. The 16- and 24-channel pipette system combines proven concepts with new innovations and facilitates quick & easy manual pipetting in 384-well plates.

Show more Product Information