• Custom microprocessor controlled for highest accuracy and reliability.
  • 3 LEDs for checking correct wiring status.
  • 15mA LOOP measurement:
  • LOOP impedance 2000Ω range measurement is carried out with low test current (15mA).
  • The current will not cause tripping out involved RCD even the one with the lowest nominal differential current (30mA).
  • Direct reading of Prospective Short Circuit Current (PSC).
  • Safe voltage measurement function.
  • Large custom digital display readout on all models.
  • Measure low loop resistances(resolution of 0.01Ω)
  • Automatic lock-out if test resister overheats.
  • Large custom digital display readout .
  • Visual indication of reversed phase and neutral wiring at socket.
  • Designed to IP54 Rating
  • Complies with IEC 61557


Front Cover

Loop Impedance Ranges20/200/2000Ω
Loop Impedance Accuracy±2%rdg±4dgt
AC Test Current20Ω 25A
200Ω 2.3A
2000Ω 15mA
AC Test Period20Ω (20ms)
200Ω (40ms)
2000Ω (280ms)
PSC Ranges200A (2.3A 40ms)
2000A (25A 20ms)
20kA (25A 20ms)
PSC Ranges AccuracyConsider accuracy of Loop impedance
Voltage110V-260V ±2%rdg±4dgt
Operating Voltage230V+10% -15% (195V – 253V) 50Hz
Safety StandardIEC 61010-1 CAT III 300V Pollution Degree 2
IEC 61557-1,-3
IEC 61010-2-031
IP RatingIEC 60529-IP54
Dimensions167(L) × 185(W) × 89(D)mm
Weight750g approx.
AccessoriesMolded plug test leads
7121B (Simplified measurement probe)
Pouch for test leads
9121 (Shoulder Strap)
Instruction Manual

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