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This display screen will show the minimum/maximum/average/current values.
'Reset button' is used to reset all minimum/maximum/average/current values to zero.
'Pause button' is used to pause a meter. It will stop that meter. It can reduce the power consumption if you don't need use that meter.
'Record button' is used to record the data, you can check the values later.
'List button' is to check the old values you already record.
It could help you to check the your ambient environment.
1. The accuracy is very depened on your device, especially the light/magnetic meter.
2. If you find some value is too larger, it maybe affect health. Recommand to buy a real accurate meter to double check it.
1. Fix compass not work in some phone.
2. Change different color if Sound/Light/Gradienter/Magnetic value changed.