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Set allows single or multiple testing. Simply fit tester between spark plug and HT lead and then run engine. Regular flashing of the testers indicates a good HT supply. Not suitable for engines with deeply recessed plugs. Features & Benefits: • Set allows single or multiple testing. • Simply fit tester between spark plug and HT lead and then run engine. • Regular flashing indicates a good HT supply. • Model No. VS5261 Specifications: Model No VS5261 Brand: Sealey Nett Weight: 0.07kg