The Foss Forward Innovations' LLG-5 Engine Heater Tester is a three-in-one tool that tests the engine block heater, its power source and extension cord. A specific amp reading removes the guesswork from deciding when to replace an engine heater. Easy to use, the Tester can significantly reduce the number of needed service calls due to cold weather starting problems. With less cranking, starters, batteries and alternators typically last longer for additional cost savings. The LLG-5 is a perfect diagnostic tool for regular maintenance managers in the shop, but it is portable for vehicle site testing as well.