Catu DT-300 Earth & Ground Resistance Tester 1.999kΩ CAT III

  • RS Stock No. 437-803
  • Mfr. Part No. DT300
  • Manufacturer Catu
Technical data sheets
Legislation and Compliance
RoHS Certificate of Compliance
COO (Country of Origin): FR
Product Details

Catohm NG DT300 Loop Controller

A device designed to easily measure earth resistance (in TT), monitor continuities and check installations (on standard 2P + T plugs or B.T. panels).
On its dual-colour LCD screen, the Catohm NG clearly and instantly displays the correct plug connection, as well as the earth resistance value, whose colour changes from blue to red beyond the 100 Ω limit (max. limit value set by NF C 15-100).


NFC15-100, IEC 61010-1 and EN 61557-4

Catu Earth & Ground Resistance Tester

The Catu earth and ground resistance tester measure a 1.999kΩ absolute maximum resistance and is having a CAT III safety category. This tester is used to ensure proper operation of the earthing system. It emits a sound signal for continuity checks and directly displays the value on the LED screen. It is also used to measure the electrical characteristics of a system. The measurement of the earth resistance, performed by this device, is based on the measurement principle called "fault loop". The measurement is carried out with an accuracy of (+/-3% +1 digit) on pure resistance, range of 0-200 Ω at 23 °C +/-5°C.

Features and Benefits

• Available with a touch point on extension cord of 7m and instructions for use, without a case
• Displays the presence of Voltage and the phase position
• Measures the earth loop (fault loop) without tripping the circuit breakers: <15 mA
• Non-slip coating for a better grip
• Once connected to a properly connected installation, the earth value is displayed instantly on the top of the 4-digit LCD display that can indicate earth resistance values ranging between 0 and 100Ω in blue colour digits (at the 100 Ω threshold recommended by NF C 15-100) and between 101Ω and 1999Ω in red colour digits
• Operating temperature ranges between -150C and 450C
• Total autonomy (without battery)
• Two-way use: 2P + T socket or LV switchboard with cord


• EN 61557-4
• IEC 61010-1
• IK06 rated
• IP40 rated
• NF C15-100

Attribute Value
Absolute Maximum Resistance Measurement 1.999kΩ
Best Accuracy ±3% + 1 Digit
Display Type LCD
Safety Category CAT III
Power Source Mains
Dimensions 210 x 71 x 51mm
Weight 340g
Height 51mm
Includes Extension Reel, Probe
Length 210mm
Maximum Operating Temperature +45°C
Measurement Type Earth Resistance
Model Number p DT-300
Width 71mm
Minimum Operating Temperature -15°C
12 In stock for delivery within 2 working days
Unit of sale: Each
(exc. VAT)
(inc. VAT)
Per unit
1 +
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