At Pipettes.com, we think about that all the time. In our view, a good solid liquid measurement tool has these specific characteristics:
A Fair Purchase Price. Expect to pay between $250 and $350 for a high quality pipette. Anything less may cost you more in the long run.
Low Cost of Ownership: Choose a pipette with a proven repair history, excellent construction, but ergonomic features.
Certified to use with a few tip options: Locking your lab into a specific pipette tip usage can help solidify results, but put the manufacturer in control of the price. Why not choose an instrument that can be certified with a variety of high quality pipette tips?
Accuracy and Precision: Take it from us, not all pipettes are consistently accurate...even some of the most popular models! Ask those who see the measurement quality every 3 to 6 months---people like the techs at Pipettes.com
Ease of Use: Look for easy smooth operation, and digital micrometer, and even better, a pipette you can use and adjust with one hand.