UT278A Clamp Earth Ground Tester can quickly and safely measure the grounding system without disconnecting circuit ground lines or the need for auxiliary electrodes. It can measure resistance from 0.01Ω with a resolution of 0.001Ω. UT275 can also measure leakage current up to 30A. These clamps’ double insulation design makes them durable tools for outdoor work and effective in blocking interference signals from the environment.

Applications of UT278A :

Grounding resistance measurement in electricity, telecommunication, meteorology, oilfield, architecture, and industrial electric equipment

Features of UT278A:

1. Resistance limit alarm
2. Auto range
3. Low battery indication




Earth Ground Resistance (Ω) 0.01~0.099Ω ±(1%+0.01)
0.1~0.99Ω ±(1%+0.01)
1~49.9Ω ±(1%+0.1)
50~99.5Ω ±(2%+0.5)
100~199Ω ±(3%+1)
200~395Ω ±(6%+5)
400~590Ω ±(10%+10)
600~800Ω ±(20%+20)
800~1200Ω ±(25%+30)
Leakage current (A) 0mA~9mA ±(2.5%+1mA)
10mA~99mA ±(2.5%+5mA)
100mA~299mA ±(2.5%+10mA)
0.3A~2.99A ±(2.5%+0.1A)
3A~9.9A ±(2.5%+0.3A)
10A~20A ±(2.5%+0.5A)
3A~30A ±(2.5%+0.5A)
Secondary Features
Display count  4 digits LCD display
Jaw opening 32mm
Resistance measurement
Single measurement time 1 second
Current limit alarm 1mA~499mA
Current measurement
Auto power off
Visual and audible alarm
Jamming signal recognition
Over-range display
Data storage 99
General Characteristics
Power 1.5V battery (LR6) x 4
Display 47mm x 28.5mm
Product color Red and grey
Product net weight 1160g
Product size 285mm x 85mm x 56mm
Standard accessories Batteries, test ring, tool box
Standard individual packing Gift box, English manual
Standard quantity per carton 6pcs
Standard carton measurement 610mm x 375mm x 320mm
Standard carton gross weight 18kg
Optional accessories RS-232 interface cable, PC software CD


Package Includes:

  •   1 x UT278A Clamp Earth Ground Teste
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