AC 90V-1000V Voltage Test Pencil Non-contact Induction Multifunctional Home Voltage Meter Pen Repair Pen Measuring voltage: AC 90V to AC 1000V Operating temperature: -10 to 50 Storage temperature: -10 to 50 Operating humidity: 80% Operating power: 2 AA batteriesnot included) How to use: Non-contact electric pen, the whole is sealed with insulating plastic, you will be protected safely without any danger of electric shock during electric inspection.