Monitoring of measuring instruments according to ISO 8655 prescribes that air-displacement pipettes have to be checked at regular intervals. However, a calibration certificate only reflects the results at the time of testing. The time between these calibrations is crucial, since leaks can occur at any time. Well over 80% of pipettes sent in for repair have leaks and are outside their volume tolerances, even if they don’t drip. Daily pipette checks with the PLT unit can provide a safeguard during these periods. Even the smallest leaks are detected! This arises from damage either to the seals, pistons or tip cones.
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