Feature: Simple operation. Brand new & high quality. Item checks general electric products electronic leakage and broken line. It\'s perfect for home use and handy when checking holiday lights. Item checks wire and tells you which is hot (fire) which is cold (ground) and incredible No battery needed. Test range: 12~250V AC DC. Material: Plastic metal. Dimensions: 16cm x 2.5cm x 1.5cm. size1:with Night lights size2:Without a night light How to use: This product is suitable for direct detection of 12V-220V AC and DC and indirect detection of the zero line phase line of AC and the detection of breakpoint. Voltage detection 1 The final figures is the voltage value. 2 It will indicate the lower value if not reach 70%of display value of the high value. 3 Please touch the negative pole when test the voltage of DC. 4 Inductance can be used when test the item with lower than 12V voltage 5 It must be connected to ground or the zero when test the item with the induction. Sensor detection When detect line side by side please increase the space between the lines or hand-hold the detected item. Break detection Move along the phase line when there is nothing shows in the display window it is the breakpoint. includes: 1 x Measure Voltage Detector Test Pen