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Really cool to see this. Definitely something we considered but the zeitronix package isn't too bad. You figure the board, components, case & accompanying labor are going to be at least 100 (unless you off-load to china with quantities in the 1000's). Then add the sensor, and two harnesses (display and sensor). Then the display itself. Followed up with QC on components you end up with a price that is not too far off what zeitronix does wholesale. But if you can get the frequency - voltage conversion done for under a hundred there will be a market for sure. What's your total build cost so far?
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