I've never seen this type of dial, so I thought this might be very useful when one needs to return a potentiometer back to an exact value.
I got it from eBay, from a seller called: delhanway2009
Product links change all the time, so if you want one, just search with these keywords: Scientific 10K Ohm 3590S-2-103L Count Rotary Wirewound Potentiometer Pot 10 Turn
