When your application demands precision and accuracy for dependable and repeatable results, turn to DWK Life Sciences — your partner on every lab journey. Our extensive portfolio of volumetric glassware includes the world’s most trusted brand names including, DURAN®, KIMBLE®, and KIMAX®. Designed, manufactured, and calibrated to deliver consistent accuracy, every piece meets or exceeds the most stringent ASTM and ISO regulatory requirements and our Class A, ASTM, and ISO glassware features thetightest tolerances available on the market.
Serialized and certified versions feature-complete traceability through a unique serial number printed on an accompanying certificate. And you can be confident that all calibrated glassware meets NIST certified standards.
Frequently Asked Questions
We’ve listened to customers and designed our pipettes with a colored ring marking at its upper end to make selection quick and easy. This color-coding is carried out according to DIN 12621.
All of our pipettes are used for precise volume measurement and are similar in shape to tubes. The difference between graduated pipettes and bulb pipettes lies in the shape and type of graduation. With bulb pipettes, only the total volume can be read off (there is no partial graduation). Graduated pipettes, however, are characterized by partial scaling, where partial volumes can be measured in addition to the total volume.
According to DIN, EN, and ISO, volumetric instruments are divided into two accuracy classes with a fixed error limit.
Here’s a quick guideline: Accuracy Class A always designates the highest accuracy with the
lowest error limit. For accuracy Class B, the double error limits of A/AS generally apply. For volumetric instruments of Class AS, calibrated to "EX", the suffix S indicates rapid execution. This accuracy variant is used for pipettes and Burets.
We’re happy to offer guidance here as cleaning and care are critical. Volumetricinstruments should be cleaned immediately after use either manually in an immersion bath or mechanically in a laboratory dishwasher. Make sure that the cleaning temperature is low, the residence time is short, and the alkalinity of the cleaning medium is also low. Volumetric instruments can then be dried (at max. 250°C) and autoclaved, disinfected, or sterilized.
The use of abrasive cleaning methods is not recommended at any time as this can damage the surface. Cleaning in an ultrasonic bath is possible, however, contact with the sound membranes should be avoided.
Dispensers are piston lifting attachments that can be used to measure defined quantities of liquid easily, quickly, and precisely, for example, from a laboratory bottle. When our dispensers are screwed onto laboratory bottles, the previously set quantity of liquid is sucked into the cylinder by an upward movement of the piston — accurate every time. The subsequent downward movement ejects the quantity of liquid via a cannula. With this principle, there is no need to adjust the meniscus.
For all Class A and AS volumetric instruments there is a retrace code which can be used to
easily download a batch certificate on our website.
No specific certificates are issued for Class B volumetric instruments.