A&D Weighing FX-300i-PT - Manual (Page 25)

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Air flow
Air flow in the measurement environment yields unstable measurement values
To reduce errors caused by air flow
z Install the balance where it is not affected by heaters or air conditioners or where no drafts exist.
Especially when using the AD-4212B-PT / AD-4212A-PT with a minimum weighing value of 0.01
mg / 0.1 mg, use much care in choosing an installation site or cover the weighing unit.
Operator
An operator’s pipetting technique influences measurements.
To reduce errors caused by the pipetting technique
z Learn and use the correct pipette technique.