Triplett 9055 - Manual (Page 18)

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2.44 Avoid usage near strong RF fields (radio or
television transmitters, walkie talkies, cellular
phones, etc.). The meter may display readings that
are in error, causing the user to misinterpret the
hazards present. For example, the meter may
indicate a low voltage when high voltages are
actually present. Failure to observe this precaution
may result in damage to the meter or injury to the
user.
2.45 Remove the battery when the meter may be left
unused for longer than 1 month. Chemical
leakage from the battery could damage the meter,
leading to user injury.
2.46 Do not attempt to test charged capacitors. Only
discharged capacitors may be tested. If you wish to
test a capacitor, discharge it using an approved
method before connecting it to the meter. Caution:
Some capacitors can store dangerous lethal
charges. Discharging these capacitors can be
dangerous unless an approved method is used.
Failure to observe this precaution may result in
damage to the meter or injury to the user.