Check the listing for details. EMX TSTL Vehicle Loop Testing Diagnostic Tool Without Tearing Up The Ground. Condition: New. Listed at 69.95 USD. EMX TSTL Vehicle Loop Testing Diagnostic Tool Without Tearing Up The Ground It can be difficult to determine if the problem is caused by the loop detector or the installed loop. Disconnect the in ground loop and connect the TSTL Test Loop for easy troubleshooting. When connected to the detector the TSTL senses metallic objects to test the loop detector’s functionality. If the gate or door operates correctly then the in ground loop is likely faulty. If the gate or door does not operate correctly then the detector is likely faulty. Features: EMX TSTL Test Loop Troubleshooting tool for vehicle loop systems Determine whether in ground loops are malfunctioning or if a loop detector is faulty Simplifies the vehicle loop repair process