©2017 Johnson Level & Tool - Rev. 1 15
4. When the laser beam is centered, mark at the front
reference marker.
5. When the detector does not receive a
laser signal for 6 minutes, and there are
no buttons pushed during these 6 min-
utes, the middle signal indicator will
turn green first and then turn red. The
horn will give two short sounds and the unit will power off auto-
matically.
5. Accessories Usage
• Connecting to the grade rod bracket
• Connecting to the grade rod
1658i-English_Manuals 1/11/17 11:50 AM Page 15
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