©2017 Johnson Level & Tool - Rev. 1 13
(b) Display
When first turning the detector on, the middle signal
indicator turns red first and then turns green. If the
horn gives two short sounds and the unit powers off
automatically, it means that the battery voltage is
low and it is necessary to replace the battery
immediately. When turning the power on and the down
signal indicator flashes, it means that the battery is low
and it is necessary to replace the battery soon.
Power Key: Turn on/off the instrument
3. Operation Guide
(a) Battery Installation
1. Open the battery cover and put the
batteries into the battery case
according to the polarity shown in
the battery slot.
2. Snap the battery cover back.
Note: Take the batteries out when the unit is not in use for a
long time.
1658i-English_Manuals 1/11/17 11:50 AM Page 13
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