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    Clamp-on Ground Resistance Tester, 0.01-1000Ω

    5 out of 5 based on 2 reviews | Write a review
    Clamp-on earth ground resistance tester is capacble of peforming grounding resistance testing accurately and simply, measuring range from 0.01Ω to 1000Ω. Leakage current measurement is also available. Rugged, durable, easy to use, ideal for outdoor work.
    SKU: ATO-GRT-UT273
    30-day Returns
    Free Shipping
    Delivery date: 6-12 days

    Clamp-on earth ground tester can measure the ground resistance from 0.01Ω to 1000Ω. With the the clamp on the loop, the meter can get the resistance value safely and quickly without disconnecting circuit ground lines or in needless of auxiliary electrodes. This clamp-on ground resistance tester is durable and accurate, suitable for grounding system measurement of electric power system, telecommunication, meteorology, oil field, building and other fields.


    Model ATO-GRT-UT273 ATO-GRT-UT275
    Earth Ground Resistance (Ω) 0.01Ω~0.099Ω ±(1%+0.01) ±(1%+0.01)
    0.1Ω~0.99Ω ±(1%+0.01) ±(1%+0.01)
    1.0Ω~49.9Ω ±(1.5%+0.1) ±(1.5%+0.1)
    50Ω~99.5Ω ±(2%+0.5) ±(2%+0.5)
    100Ω~199Ω ±(3%+1) ±(3%+1)
    200Ω~395Ω ±(10%+5) ±(10%+5)
    400Ω~590Ω ±(20%+10) ±(20%+10)
    600~1000Ω ±(25%+20) ±(25%+20)
    Leakage Current (A) 0.00mA~299mA ±(2.5%+2mA)
    0.30A~2.99A ±(2.5%+100mA)
    3A~30A ±(2.5%+100mA)
    Features Display 9999 counts 9999 counts
    Auto range
    Jaw opening 28mm 28mm
    Auto power off
    Low battery indication
    Data hold
    Data storage 30 sets 30 sets
    Data recall
    LCD backlight
    Auto calibration
    General Power supply 1.5V battery (LR6) x 4
    Display size 47mm x 28.5mm
    Operating temperature 0℃ ~ 40℃
    Operating relative humidity 10%~90%RH non-condensing
    Operating altitude ≤2000m
    Product weight 1.5kg
    Product size 293mm x 90mm x 66mm
    Standard accessories * Batteries, test ring, carrying box

    Note: * Batteries are Not Included for air shippment.

    Tips: Measuring principle of clamp-on ground resistance tester

    1. Resistance measurement principle

    The basic principle of measuring ground resistance with a clamp-on earth ground tester is measuring loop resistance. The jaw part of the clamp meter is composed of voltage coil and current coil. The voltage coil provides the excitation signal and induces a potential E on the circuit under test. Under the action of potential E, current I will be generated in the circuit under test. The clamp ground tester measures E and I, and through the formula R=E/I, the measured resistance R can be obtained.

    2. Principle of current measurement

    The basic principle of measuring the current of the clamp-on ground resistance meter is the same as that of the current transformer. AC current I of the measured wire generates an induced current I1 through the current magnetic ring and current coil of the clamp. I1 is measured by the clamp meter. The measured current I can be obtained by formula I=n* I1 (n is the turns ratio of the coil between the auxiliary side and the original side).

    Existing reviews of Clamp-on Ground Resistance Tester, 0.01-1000Ω
    Great price on a well performing instrument
    I received the  ground resistance tester very quickly after placing the order, I have a project to go back to test the ground rods that were not tested at the time of installation, It is easy to use and very accurate.
    From: Steyn | Date: 07/05/2022
    Was this review helpful? Yes No (0/0)
    Can this tester be calibrated?
    Well, before I order this tester, I want to sure can this clamp-on ground resistance tester be calibrated as required by some clients? Is it easy to calibrated? I hope you can give me a favor.
    From: Stephen | Date: 24/04/2022
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Yes, you can calibrate it and it is quite easy.
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