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Portable Tachometers

Portable Tachometers

Portable Tachometers

(OP)
Could anyone tell me the name of the company or where to find info on the tachometers used at the emissions testing centre. They are just placed on top of the hood of the vehicle. How do they actually measure engine speed?
Thanks
Gav

RE: Portable Tachometers

Bear / Sun / specific leads for engine analyzers.

Other handhelds available using IR technology.

Pads over the hood detect the HIGh voltage from the IGNITION system.

IR uses the reflections and doppler

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