Strain Gauge Based Repeat-o-Meter

Hi there,

I’ve seen multiple variations of the Repeat-o-Meter device, Rahn’s original one uses a micron range mechanical indicator (Mahr Millimess), Robin Renzetti has built a nice one based on an LVDT indicator (Federal ? IIRC).

Given that the quantities usually checked with the tool are quite small I was wondering if anyone knows of a strain gauge (flexure) based version ?

If not, is there an obvious reason why it doesn’t exist (like linearity problems I might not be aware of etc.) a more subtle gotcha around strain gauges that makes them impractical for that purpose or is it just that no one did .. yet ?

Thx