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Operating instructions for historical Bosch testers ; Tester. Stroboscopic timing light with advance angle meter. Operating instructions. ETZ 005.00 (PDF).1. Press and Release. Button Until RPM Indicator Lights. If engine is not running or #1 spark plug is not firing, timing light. 1. Press and Release. Button Until RPM Indicator Lights. If engine is not running or #1 spark plug is not firing, timing light. Works on 6V and 12V vehicles (6V use requires a separate 12V automotive battery for power). Includes comprehensive instruction booklet in English, Spanish, and