LitePette mechanical pipettes are newly designed with new innovative materials in order to be the most ergonomic pipette in the industry while maintaining durable chemical-resistant properties. LitePettes are most economically-priced pipettes for practical everyday lab use. Available models include single-channel adjustable, single-channel fixed, and multichannel (8 and 12-channel) adjustable. They work with universal pipette tips from most manufacturers worldwide however we recommend using them with KaliTips; superior quality universal-fitting pipette tips that work perfectly with these and other pipettes. The adjustable pipettes can be adjusted by turning the plunger knob in either direction to the desired volume which can be read in the display window on the side. Note: There is not a volume-locking function on these pipettes.