Does someone make a contactless tachometer?

Hello, I'm doing a balancing system that will use a tachometer and an accelerometer to determine how much weight to add to a rotor and whether to add it to or to balance.  Has anyone done a contactless device that allows to determine RPM?

The PCB laser tachometer requires a power supply of PEAK.  http://www.modalshop.com/test_tmproducts.asp?ID=19  You need one of them to work with the 9215 module.

Tags: NI Hardware

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