ADA INSTRUMENTS ProLevel 60 Operating Manual page 4

4
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again to set current angle to zero, REF icon will be displayed to indicate
relative angle measurement mode. Hold button A for 3 seconds to turn
off. An auto-off feature shuts the display off after a period of inactivity to
preserve battery life.
2) Button B - press once to enter the HOLD function and for the H icon
be displayed, press once again to release hold function. Press and hold
button for 3 seconds to activate sound function. Beeper will sound at
level (0) and plumb (90). The sound function utilizes a series of beeps that
increase in tempo eventually reaching a constant tone at exactly 0 and 90
degrees as it approaches 0 and 90 degreees.
3) Button C converts angles to different units. Push once to change the
display units from degrees (°) to mm/m, to percent slope (%), to pitch (in/
ft). Hold button for 3 seconds to turn on light. Touch any key to illuminate
the display while light function is on. Hold button again for 3 seconds to
turn off light.
TECHNICAL DATA
Power supply: 2x1.5 V AAA batteries
Angle measuring range: 4x90
Resolution: 0.1°
Accuracy of digital level: 0.2°
Accuracy of vial: +/- 0.029°
Working temperature: -10°C to 50°C
Storage&shipping temperature: -20°C to 70°C