CE CAT. III 1000V / CAT. IV 600V Voltage Tester professional AC voltage detector is safely double insulated. High Voltage Alert to warn you of voltage above 90V, the indicator lamp turn red, perfectly suitable for DIY'ers, hobbyists and homeowners, which helps you make the First and the Most Important Safety Check. ( Note Please:Not Suitable for Christmas DC Powered Light Testing) Dual Range Electrical TesterThe upgraded circuit testers default mode is 48-1000V(Low Sensitivity), press the S to switch to 12-1000V(High Sensitivity), which can meet standard and low voltage (12-1000V AC / 48-1000V AC) for more sensitive and flexible measurements. Also, it is easier to identify live and null wire when the wires are neighbouring. Non-Contact Voltage Tester with Indicator LampWith NCV inductive probe for AC voltage; just place the tip near a terminal strip, outlet, or supply cord, which can tell live and null wire without safety problem. When the buzzer alarms slowly, light flashes slowly and