Extech Instruments DT40M User Manual page 5

Keypad Description
Short press: Power ON
Short press: Laser ON (can be set to default ON)
Short press: Single distance measurement
Long press: Continuous measurement mode
Short press: Datalogger mode (press CLR to exit)
Long press: Open program menu
Short press: Clear display; Long press: Power OFF
Short press: Area/Volume mode
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Long press to 1 beep: Stakeout mode
Indirect measurements
Press 1x: Single Pythagorean mode
Press 2x: Double Pythagorean mode
Press 3x: Double Pythagorean (partial height)
Add / Subtract keys
Short press: Measurement edge selection
Long press: Backlight ON/OFF
Short press: Select unit of measure
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