This WestNet Circuit Tester designed to detecting low voltage circuit failures in transportation machinery, Simple operation, convenient use, secure and reliable, If the indicator light is on, there is electricity. Great quality and super convenient to bring with. Testing equipment can be put to good use ensuring that electrical equipment is properly installed and safe to operate. the condition of electrical installations can be established when contractors use test equipment. Workpro is pleased to offer an innovative full feature line of test equipment designed to make electrical work faster and safer. Quickly tests automotive circuits for proper voltage. Can test within the 6-12-Volt range. • Designed to detect low voltage circuit failures in transportation machinery. • Simple operation, convenient use, secure and reliable. • Sensitive detection, accurate test result and fast measuring speed. • Light in handle glows when circuit connection is complete. • Test a range of circuits ranging from 6V to 24V. Auto 6V 12V 24V DC Car Truck Voltage Circuit Tester Car Test VoltMet Long Probe Pen Light Bulb,Electrical Wire Circuit Tester, 6V 12V 24V Volt Probe Pen, Voltage Range: 6V-24V