SurfaceYour zero Locked
0.0°
Lay it flat or stand it on an edgeFlat on a shelf or table, you get the bubble with two axes. Stand the phone on its edge against a frame or shelf for the tube level.
0 in
Not calibrated
Bank card
Match a bank card
Hold any bank, ID or library card flat on the screen in the top corner, and resize the drawn card until it matches exactly.
Put one end of the thing you're measuring on the zero line, then drag the other handle to its far end. Drag the zero line too, to measure between two marks. Calibration is saved on this device.
60.0°Reflex 300.0°
Drag the two round handles to the arms of your angle, and the centre dot to its corner. Lay a small object on the screen, or line the arms up with a photo. Arrow keys nudge the selected arm.
0°NorthMagnetic north
Hold it flat, away from metalMagnets, cases with clasps, laptops and steel tables pull the needle. If it looks wrong, wave the phone in a figure of 8 a few times.
–dB
Estimate: phone mics aren't calibrated
Tap Start to measure
20406080100120
Min–
Avg–
Max–
0:00
Last minuteOffset +100 dB
How loud is that?
Nothing is recorded: the page reads the microphone's level and keeps only the numbers. For a closer reading, set the offset against a real sound level meter in Settings.