For 12/24/48V DC systems For application of DC circuits only Check if the circuit is electrified or not by stainless steel stylus Test by car battery or negative ground conversion 3M long retractable cable 1M extension cable Powered from the power source being measured, no batteries required Nixie display easy to read digital voltage display CE approval EN 61000-6-3(2007) , EN 61000-6-1(2007) Do not use on air bags Ultra-V will burn circuit board