Test kit includes Low Resistance Tester and Calibration Unit. Allows operators to test for continuity, shorts,ÿgrounds or the presence of voltage quickly,ÿeffectively and economically. Designed to verify electrical connection of less than 0.1 ohms. Quick test that connection is secure and high-quality, and not being compromised. Audible signal and LED illumination alerts user immediately with test results. Operates on 2 standard AA alkaline batteries; rechargeable NiCad batteries can also be used. Low battery pulsing audio and visual indication indicating low batteries needing replacement. Rugged extruded aluminum case is durable, providing long life. The tester may be easily calibrated. Easy to verify accuracy and perform adjustment. Test kit includes case which provides sturdy protection for tester and calibration unit.Made in America for superior quality