Johnson Level & Tool Mfg. 40-6006 - Manual (Page 16)

16 ©2013 Johnson Level & Tool - Rev. 1
Tips from the Pro’s
Take more than one measurement in critical situations where accuracy
needs to be greater than an estimation measurement. Take three to
four measurements from the same position to compare consistency of
each reading. Prior to important measurements verify that the
instrument is in proper working order and take sample measurements
to a known distance to verify accuracy.
To accurately measure from the rear of the instrument, use a scrap
piece of drywall or other flat material. Extend the material off the
corner and butt the LDM up to the material. Then take measurement.
Place a white sheet of paper over the targeted measuring surface if
error message Err02 occurs to improve the return signal.
7349H-English_Manuals 9/6/13 1:55 PM Page 16