Probe Circuit Tester 12V 24V Car Electric System Diagnostic Tool Battery Tester. 1 × Probe Tip. We have OBDII cars / Light Trucks / Heavy Duty Truck's, Battery Tester, Fuel Injector Cleaner Machine, Smoke Leak Detector Machine, Digital Circuit Tester, lgnition Spark Tester, Engine Timing Tool, and much more others products.