Quite simply: the best insulation tester!

Ideal for tests on telephone lines or electronic equipment, the C.A 6533 megohmmeter measures insulation at 50V, 100V, 250V and 500V, as well as resistance. It indicates the AC/DC voltage before each measurement.

* insulation: up to 20GΩ at 50V, 100V, 250V and 500V
* voltage indication before insulation measurement: 0 to 600V AC/DC (blocking if U>25V)
* resistance: 0 to 400kΩ
* giant 4,000-count display + bargraph (simultaneous reading of the measurement and analogue
  variation) 

* backlit display
* programmable alarms 

* DREL function for testing for the presence of transmission frame or measurement of the
  difference in resistance between 2 wires of a pair
* remote control probe (option)
* back stand for use on a table or on the ground
* long battery life: 6 x 1.5V batteries
* Measurements in compliance with IEC 61557, NF C 15-100, VDE 0413
* electrical safety: IEC 1010 300V Cat. III