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MTD20KWR Digital Earth Tester

The MTD20KWR is a versatile earth tester designed for accurate measurement of grounding resistances, soil resistivity, and parasitic (spurious) voltages in the soil. It’s ideal for a wide range of applications including residential and industrial grounding systems, hospitals, lightning protection, antennas, and substations.

Equipped with advanced filtering technology, the MTD20KWR ensures reliable measurements even in electrically noisy environments such as urban areas or near substations. Its internal 1,470 Hz current generator injects alternating current into the ground for precision testing. The device also alerts the user when the injected current is insufficient, ensuring confidence in test results.

Housed in a rugged, portable case with IP65 protection (closed lid), it is built for tough environmental and geographical conditions, performing reliably across extreme temperatures and altitudes.

Key Features

  • Measurement of earth resistance (3-terminal method)

  • Soil resistivity measurement using Wenner’s method (4-terminal)

  • Detection and measurement of spurious AC voltages in the soil

  • High resolution resistance readings down to 0.01 Ω

  • Wide resistance measurement range: 0 – 20 kΩ

  • Voltage measurement up to 200 V AC

  • Graphic LCD display (128 x 64 pixels) for clear readings

  • Rechargeable NiMH internal battery with smart microprocessor-controlled charger

  • External power option via 12 V car battery or similar

  • IP65 rated enclosure for dust and water resistance (lid closed)

  • Compact and lightweight for field use

Technical Specifications

Specification Details
Applications Earth resistance (3-terminal)
Soil resistivity (4-terminal)
Spurious voltage detection
Resistance Measurement Range 0 – 20,000 Ω (20 kΩ)
Voltage Measurement Range 0 – 200 V AC
Measurement Accuracy Resistance/Resistivity: ±2% ±2 digits
Voltage: ±2% ±2 digits
Resolution Resistance: 0.01 Ω
Voltage: 0.1 V
Output Power < 0.5 W
Output Current < 10 mA (max)
Power Supply Internal rechargeable NiMH battery
External 12 V battery input
Battery Charger Smart microprocessor-controlled charger, powered by AC adapter or 12 V battery
Operating Temperature -10 °C to 50 °C (14 °F to 122 °F)
Storage Temperature -25 °C to 70 °C (-13 °F to 158 °F)
Humidity 95% RH, non-condensing
Weight Approx. 1.5 kg (3.3 lbs)
Dimensions 221 × 189 × 99 mm (8.7" × 7.44" × 3.9")

Included Accessories

  • 4 steel spikes

  • AC adapter

  • Reel with 40 m (131.23 ft) red cable

  • Reel with 20 m (65.62 ft) blue cable

  • Reel with 20 m (65.62 ft) green cable

  • 5 m (16.4 ft) short black cable

  • 5 m (16.4 ft) short green cable for ground connection

  • Connection wire for 12 V external battery charger (car battery)

  • Quick reference guide

  • User manual (download)

  • TENTECH Remote Control App (download)

  • Transport bag for equipment

  • Transport bag for accessories

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