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C & K Instrument (Hong Kong) Limitedcnkgroup.com/catalog/470.pdf · Rpm measurement — testo 470 The idea combination of optical and mechanica rpm measure- ment. An op ical measurement

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Page 1: C & K Instrument (Hong Kong) Limitedcnkgroup.com/catalog/470.pdf · Rpm measurement — testo 470 The idea combination of optical and mechanica rpm measure- ment. An op ical measurement