1. Add 1 by the COUNT key value.
2. Clear by RESET key.
3. Sleep mode will automatically enter if you do not use it for about 15 minutes. In sleep mode, after waking up by pressing the COUNT key, the screen displays the value before sleep, at which time it can count normally.
1. It may be a little color difference, but it does not affect the use.
2. Please allow 1-3cm measuring deviation due to manual measurement.