3. UPDATE. Black outer case does not emit excess light not affect reading. Top Probe design has a better contacting with fence tap than curved hooks type. 1. WIDE MEASURING RANGE. Designed for a low impedance and standard duty fence controllers. 8 Neon lights indicate voltage from 2kv to 12kv. Higher measuring range than normal item. Though not as bright as LED, do not need battery 2. WIDELY APPLICATION. Measuring voltage on any metal wire, poly wire, rope and poly tape. Test Fence line, , Ground System, Hook Up Wire and Fence Components. Used in Farm, Home Garden, Sheep, Pet, Horse and Livestock Fencing. 4. EASY TO USE. Hold top probe to the fence. Insert probe into ground, you could know the reading of your fence. Require no addtional tool. human design is comfortable to hold. 5. LONG LASTING: ABS case, Withstand cold weather. Easy to carry., Weight: 0.20502990366 pounds, Manufacturer: melairo