... but also three phase meters. It is a range of hand held, single and three phase portable working standards, ideal for on site ... , oscilloscope function & percentage error with 4 digits, sign and decimal point.* Circuit type: 3 phase 4 wire, 3 phase 3 wire, 1 ... (automatic) testing.* A built in memory for the storing of results and displays exist. A RS232 connector exists for data transfer. Optional ...