Home Trusted by 500,000+ buyers

Insulation Resistance Testers - Models DET3 & DET4 Contractor Series

Supplier: Maceys Electrical


Price Guide: POA

  • 2 and 3 point testing.
  • 4 point testing with DET4TD.
  • ART (Attached Rod Technique) testing capability with DET3TC.
  • Choice of digital or analog (DET3TA) display.
  • Warning indicators prevent test failure IP54 rated.
  • Complete with lead and stake kit.
  • Simple one button operation.
  • Rugged carry case.
  • Calibration test certificate included(except DET3TA).


The new ground testing instrument family from Megger offers a unique solution to your ground rod testing needs. The four models comprise a digital 3-terminal instrument for grounding and bonding tests, a digital 4-terminal model that adds resistivity measurement, an analog 3-terminal model, and a revolutionary new 3-terminal tester that adds a current measuring function for ART (Attached Rod Technique) testing capabilities. With this added function, on-site grounds can be tested separately without having to remove the utility connection.

The complete kit of instrument, test leads, stakes, batteries and calibration certificate are delivered in a tough polypropylene carry case — everything you need to start testing in one package. (Certificate not included with analog model.) Optional terminal adapters are available for acceptance of a variety of test leads.

All models are rated to IP54, making them truly outdoor instruments. The ground testers have been designed to be easy to use – a large selector switch makes selection of 2-pole, 3-pole or 4-pole (DET4TD) tests easy with gloved hands – and the design makes the fitting of shorting links to perform 2-pole tests a thing of the past. A large, clear, easy to read LCD or analog (DET3TA) display and thumb sized test button also make the instruments particularly well suited to the outdoor conditions of ground testing. In addition to this ease of use, the ground tester automatically checks the connection and condition of the P spike, C spike, and also the level of ground noise, indicating the status on the display. (The analog model allows the operator to check the condition of the spikes.)

The instruments also include a voltmeter to enable measurement of ground voltage. The testers can measure resistance from 0.01 ohm to 2000 ohms and earth voltages up to 100V. To allow accurate testing in noisy environments, the instruments are capable of rejecting noise of up to 40V peak to peak.

The Megger digital and analog ground testers are powered by eight AA batteries which are widely available and also give excellent testing time – the status of these batteries is given by a bar graph on the LCD display, allowing the operator to decide when to change the batteries before they expire. (On the analog model, battery status is indicated by selecting the function on the selector switch.) The Megger ground testers are designed to meet stringent safety standards and are rated CAT. IV 100V.