A&D Weighing HR-202i - 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, placing and
removing a sample). Use a pair of tweezers 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 the 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
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 the AC adapter always be connected.