Accuracy: 20uL +/- 1.8% 200uL +/- 0.8%. Precision +/- 0.4%@20uL, 0.15% at 200uL. Easy to set volumes, Ergonomic grip, Removable tip ejector for tight spots. These new pipettors are highly accurate. Within ten complete revolutions of the dial, you can set the minimum and maximum volumes. And, for ease of use, the dial is fixed to the plunger. Since the light plunger action reduces fatigue, results are more precise.