Appearance requirements

The surface of the pipette plastic parts should be flat and smooth, and there should be no obvious sink marks, scrap edges, cracks, bubbles and deformation; the surface coating of metal parts should be free of detachment, rust and layer formation.

The pipette body should have the following markings: product name, manufacturer or trademark, nominal capacity (ul or ml), model specifications, and factory number.

piston

When pressing the pipette's piston, the up and down movement should be flexible, and the dividing limit is obvious.

Regulator

The display window of the pipette should rotate flexibly when the address is adjusted, and the digital indication is clear and complete.

Tip

Tips should be made of polypropylene.

The tip must not be significantly bent. The inner wall should be smooth and smooth, and there should be no residual liquid after drainage.
Pipettes of different specifications and models should use corresponding matching tips.

Verification medium

The test medium should meet the requirements of distilled water or deionized water, and should be placed in the laboratory 24 hours in advance so that the temperature difference between room temperature and room temperature should not be greater than 2 degrees.

The pipette to be tested should be placed in the laboratory or other conditional space 4h before the test.