Final installed tacho (Digital).

The sensor range is about 1 cm. The round 6mm diameter x 3mm thick magnets are from ebay (Hong Kong)

 
 
 

The mounting plate is 3mm aluminium angle. The plastic is lexan. The photos were taken before the sensor was encased in clear hot-melt glue.
The socket head bolts are conical to clear the cover when it closes. (Normally the bolts are flush, recessed into the chromed bearing retainer.)
The magnets can be seen in the c-wrench slots in the retaining rings. The sensor range (with the sensitivity pot correctly adjusted) is about 1cm.
The printed cicuit board is only there to provide a way to mount the 5 Pin mini-USB connector. I used the same cables on each of my sensors.

*** WARNING This sensor is 5 Volts, not 3 Volt like the iGaging scales. If you mix up your cables, you WILL destroy your scales. ***

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