To that end, this popular instrument series includes four models with different kit variants that contain various accessories for greater testing flexibility. The four basic units are:

• DET4TD2: Dry-cell battery-powered basic four-terminal tester
• DET4TR2: Rechargeable battery-powered basic four-terminal tester
• DET4TC2: Dry-cell battery-powered four-terminal tester with selectable test frequencies, greater measurement sensitivity, attached rod technique (ART), and stakeless measurement capability
• DET4TCR2: Rechargeable battery-powered four-terminal tester with selectable test frequencies, greater measurement sensitivity, attached rod technique (ART), and stakeless measurement capability

The DET4TC2 and the DET4TCR2 testers are for demanding applications requiring maximum versatility. These instruments support two-, three- and four-pole testing, as well as attached rod technique (ART), stakeless, leakage current, and earth noise voltage measurement. They also allow you to select the test frequency from one of four options: 94 Hz, 105 Hz, 111 Hz, and 128 Hz, making it easy to choose a frequency that minimises the effects of interference, even in difficult situations.
 
When the exceptional versatility of the DET4TC models is not needed, Megger offers the DET4TD2 and DET4TR2 testers, the former designed for use with replaceable batteries and the latter with rechargeable cells. These competitive instruments fully support the most popular earth resistance test methods – two-, three- and four-pole testing.

All DET4 models are rated to IP54, making them ideal for outdoor working, and they are designed to meet stringent safety standards, rated CAT IV to 100 V. Additionally, all the DET4 instruments are ergonomically designed with a large selector switch enabling you to easily select two, three, or four-pole tests, even with gloved hands.