features :
  -9999-count LCD display with analogue bar
  -250V~1000V DC insulation resistance test
  -200mA earth-resistance continuity test
  -Loop impedance/Prospective Fault Current (PFC)/Prospective Short
   Current (PSC) test
  -Lock test
  -RCD trip time test and the data storage with one key
  -Full/Half wave and count downing (30s) test mode selectable
  -0°/180° phase angle option to detect the fastest trigger time
  -Trip current test of RCD trip time X2
  -RCD trip trigger current test
  -Phase sequence and missing test
  -AC/DC voltage auto check and test
  -Connection check with status real-time display
  -White backlight; auto power off