Tool Point Silicon Waves Analogue Circuit AC, DC Electrical Tester Features : - Contact / Non-contact AC Detection - DC voltage detection - Electronic components check - Hi-Low sensitivity switch equipped - Compact in design, pocket clip for easy carrying - Low power consumption - Powered by two 1.5V button cells - Ideal for Homeowner, Handyman, Hobbyist and Professional technicians Examples of Application : - Check hidden wire in the wooden wall / dry wall - Find break in wire - Identify LIVE Slot - Check switches - Check car ignition / auto accessories - Check home appliances for proper grounding - Test weak batteries / cell - Check battery polarity - Check fluorescent tube / starter - Check silicon transistors, diodes, LEDs and capacitors - Check speaker / headphone - Check continuity on DC circuits. Voltage detection:  The final figures is the voltage value. It will indicate the lower value if not reach 70%of display value of the high value. Please touch the negative pole when test the voltage of DC. Inductance can be used when test the item with lower than 12V voltage 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. It checks general electric products, electronic leakage and broken line. It's perfect for home use and handy when checking holiday lights.  Break detection:Move along the phase line, when there is nothing shows in the display window, it is the breakpoint.