A&D A & D Analytical Balance GH-120/GH-200/GH-300/GH-202/GH-252 - Manual (Page 11)

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Press the RE-ZERO key before each weighing to prevent
possible errors.
Calibrate the balance periodically so as to eliminate possible
errors.
Take into consideration the affect of air buoyancy on a sample
when more accuracy is required.
Avoid foreign matter (dust, liquid or metal fragments) that could
get inside the balance.
Operate your balance gently. Shorten the operation time as much
as possible ( Opening and closing door, putting and removing
sample). Use a pair of tweezers (pincette) to avoid temperature
changes due to heat from inserting your hand into the weighing
chamber.
3.3.
After Use
Avoid mechanical shock to your balance.
Do not disassemble the balance. Contact your local A&D dealer if
your balance needs service or repair.
Do not use solvents to clean the balance. For best cleaning, wipe
with a dry lint free cloth or a lint free cloth that is moistened with
warm water and a mild detergent.
Avoid foreign matter (dust, liquid or metal fragments) that could
get inside the balance.
3.4.
Power Supply
Do not remove the AC adapter while the internal mass is in motion, for example, right
after the AC adapter is connected, or during calibration using the internal mass.
If the AC adapter is removed under the conditions described above, the internal mass
will be left unsecured, that may cause mechanical damage when the balance is moved.
Before removing the AC adapter, press the
ON:OFF key and confirm that zero is
displayed in weighing mode.
When the AC adapter is connected, the balance is in the standby mode if the standby
indicator is on. This is a normal state and does not harm the balance. For accurate
weighing, we recommend that you always plug in your balance so it can warm up.