21
The instrument should show a value of
114dB minus the height offset value.
If the value displayed deviates by more
than ±0.2dB from the target value and it
also cannot be reduced by recalibration,
please contact your dealer or Testo
Customer Service. You will find contact
details at
www.testo.com
.
8. Care and Maintenance
Changing the battery
If the battery voltage needed to operate
the calibrator is insufficient, the control
lamp on the front lights up red.
1
Open battery compartment.
2
Insert battery (9V block - 6 F 22),
observe +/-.
3
Close battery compartment.
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