Eight variable volume MicroPette's in the range. Volume adjustment is selected by turning the thumb plunger mechanism. MicroPette's are calibrated in accordance ISO/DIS 8655. Each pipettor passes a quality control/calibration test and is supplied with acertificate. Lightweight and ergonomic design. Clear digital display. Integral tip ejector for access into narrow tubes. Easy to calibrate and maintain with tool supplied. Autoclavable tip-cone. Used with 'universal' pipette tips. 3 YEAR WARRANTY