General description This product is a Draper Expert 82833 Soft Grip Trimming Knife with a Safe Blade Retractor and a Draper H.T. System Tester Set, which includes 4 pieces designed for quick and easy testing of petrol ignition systems. It helps identify faults in individual or multiple cylinders, ensuring proper engine function. Technical specifications Contains 4 pieces of high tension testers Compatible with all petrol cylinder types Features a flash tube for voltage indication Designed for quick fault detection in ignition systems Compatibility and accessories Compatible with petrol engines Includes spare blades for the trimming knife Installation No specific installation required; simply connect the tester to the spark plug or ignition system for testing Usage Use the tester to quickly check for high tension voltage in petrol engines Identify faults in individual cylinders or multiple cylinders For trimming knives, use the retractable blade feature for safe and precise cutting