1. QUALITY: Automotive Circuit Tester Probe Made of metal, Used for Threading, With A Large Alligator Clip for Convenient OneHanded Operation. Also, It Can Reach Tight Areas That Are Hard to Reach. ABS Body Provides Durability Over Other Products. A OfTheLine 47Inch PU Wire That Provides Heat Insulation, Wear Resistance, And Tensile Strength to Test Light for car. 2. TESTER LIGHT BULB: This LED test light circuit tester bulb has visibility and long service life. It can indicate the state of the circuit. The brightness of the 3W lamp can be changed with the measured voltage and can be replaced. 3. WIDE APPLICATIONS: 624V Automotive Screwdriver Test Light, Widely Used Circuit Test, for Various Circuits on Automobiles, This Automotive Tester Can Also Be Used for Other 624V Circuit Test, Including Battery Test, Headlight Test, Brake Light Test, Fault Connections and Injector Signal Test.