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I am not sure but it could be a twin thermocoulple with body used as ground.you may try out with a dmm in mV DC mode and by applying some heat.Found this knocking around in a box of old bits in the loft, always assumed it was a primitive condenser but on second thoughts is it ?
the front has a code on it: 030A10
Any ideas to satisfy my curiosity ?
It looks more 'electrical' than 'electronic', doesn't look very useful though.