The EDT 6 electronic digital tachometer Is a handy, pocketsize measuring instrument for two and four stroke spark ignition engines. Further more, this instrument stores the time that elapses during active RPM measurement in two ways: - As a temporary elapsed time meter, which can be reset as required. - As a cumulative elapsed time meter. Pulses are picked up by holding the tachometer close to the ignition system or attaching the test lead provided to the ignition lead. The tachometer´ power consumption is extremely low. Its lithium battery therefore has a very long lifetime. The battery is not replaceable. The display is turned off one minute after the last measurement.