Johnson 40-6001 Manual De Instrucciones página 24

Tips from the Pro's
Take more than one measurement in critical situations where accuracy
needs to be greater than an estimation measurement. Take 3-4
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 of 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.
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