Do I need to choose the range myself?
No need, for your convenience in measuring resistance, the product will automatically range and also come with a short-circuit current/voltage design to protect the circuit of the measured product.
How should I start measuring?
After inserting the wires according to the instructions, simply press and hold for two seconds to turn on the device, click "TEST" to start the measurement, and click "TEST" again to end the measurement.
Will this use be very dangerous?
No, the shell is insulated. And whats even better is that during measurement, this insulation testing resistance meter will have a high/low voltage prompt and will automatically discharge, which is particularly safe.
Can absorption ratio DAR measurement and polarization index PI measurement be performed?
Of course!