Sper Scientific 850016 Acoustical Calibrator - 2 Point - Manual (Page 4)

BATTERY INSTALLATION AND REPLACEMENT
• Replace the battery if the Power Indicator (3) does
NOT light when 94dB/114dB/Off Slide Switch (4)
is in the 94 dB or 114 dB position and/or when there
is no audible tone.
• Unscrew the Battery Compartment Ring (5).
• There are wires connected to the Battery Compart-
ment (6), so SLOWLY lift the center to access the
battery.
• Insert a fresh 9V Alkaline battery.
• Replace the Battery Compartment (6) and tighten
the Battery Compartment Ring (5).
• A fresh Alkaline battery should power your calibrator
for approximately 20 hours of use.
• Remove the battery if the calibrator will not be in
use for a long period of time.
• Tampering with the internal circuitry will void your
warranty.