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They detect defects by creating a voltage potential on an electrode, passed over a conductive surface. The detector is also grounded. As holes or fissures in the coating are passed over, the voltage jumps the gap and completes a circuit which then causes a horn (also known as a jeep) to sound.
Holiday Detector Spy Model 790
Unique technical features
Its range of voltage from 0 KV to 05 KV in continue mode allows you to set the voltage exactly to the level you desire for the coating you are inspecting, any pipe size from 2' up to 60' whatever the coating may be somatic, tar, asphalt extruded coats, tapes or thin film epoxy coating. You have at your control the voltage setting that you require. One battery and a universal charger are part of the package. More efficient circuitry means reduced current drain and prolonged battery life and cost saving.
* Input supply : Operated by built-in single 6 V, 4AH battery
* Output Voltage : 0 KV to 05 KV DC
* Size : (W) 7" (L) 8.5" (H) 2.5"
* Weight : 2.00 Kgs. with battery, approximately
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