Johnson Level & Tool Mfg. 40-6005 - Manual (Page 11)

©2013 Johnson Level & Tool - Rev. 1 11
To add another measurement to sum (repeat same measurement
sequence) to tally.
To subtract a value in the tally sequence press button.
This laser distance measure has the capability to add or subtract area,
volume or indirect measurement calculations. For example, if you need
the square footage of four rooms this instrument will allow you to add
each area calculation together to sum the dimensions of the four
rooms. The same holds true for volume or indirect measurement
modes. Please see each respective measurement section for the
step-by-step instructions.
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