Klein Tools Electrical Test Kit RT250KIT LCD Receptacle Analyzer Dual Range Volt Pen (12 to 1000V AC GFCI Millisecond Timer Circuit Fault Diagnostics) Concrete and Mortar Mixers prevents gumming prevents gumming Quadra Cut 4 Cutter Technology: Four independent cutting edges shear both upward and downward simultaneously Breaker Trip Interrogation: Calculating the exact millisecond response timing of structural safety interrupter outlets during building safety inspections Volt Pen Sensing Scale: 12 to 1000V AC 70 to 1000V AC Maximum LCD Input Potential: 135V AC Maximum Volt Pen Safety Standard: CAT IV 1000V LCD Tester Safety Standard: CAT II 135V Chassis Drop Protection: 6