Byeke 0.28" micro waterproof DC 3.50-30.0V two-wire led digital voltmeter dislpaly volt panel meter voltage tester Gauge Monitor (Yellow) ReviewbP PP yeke 0.28" micro waterproof DC 3.50-30.0V two-wire led digital voltmeter dislpaly volt panel meter voltage tester Gauge Monitor (Yellow) PDimensions: 27mm * 15mm * 18mm (with fixed ear size)PRange : DC3.50-30.0VPDisplay: three digits 0.