Gilson Pipetman Eras:
Old-Style Pipetman: Introduced in July 1979. Serial numbers range from H-79xxxxx through N-85xxxxx. Two-piece piston assemblies introduced June 1982 (G-82xxxxx). Have three (3) upper silver colored calibration screws, and three (3) lower brass colored screws. The actual calibration mechanism is silver colored not upgraded to a black calibration screw as with the next Pipette era below.
All of the Gilson Pipetman eras have the same black colored, 6-hole calibration screw as shown below.
New-Style Pipetman: Introduced in January 1986 featuring a sturdier and new serial 6-hole calibration mechanism numbers CxxxxxA through JxxxxxA.
Modified Pipetman: Introduced in February 1991 featuring a new long-life friction ring. Serial numbers are JxxxxxB through NxxxxxE.
Plunger-Adjustable Pipetman: Introduced in December 1995 featuring easier adjustment by using the volume adjustment knob or by turning the plunger button. Serial numbers range from NxxxxxE and higher.
See the chart below for Gilson Pipetman year classifications.
Related Posts:
Styles of Gilson Pipette Tip Ejectors
Trouble Shooting Gilson Pipetman Calibration Concerns
Gilson Pipetman Counter Assembly Realignment
Pipetman Calibration Wrench, Item # 27777
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