In message , Harry Bloomfield
writes
Tim Lamb has brought this to us :
and a digital vernier gauge. Left connected, 4 weeks battery life:-(

My two verniers last around a year, before needing new batteries, but
then I don't handle the replacement batteries with my fingers :-)

Mostly I use a simple vernier: the digital lives in a case with the 2302
battery removed.

The thermometer might get used twice a year checking the underfloor
heating (noticeable 2-4 deg. C difference from pipe to gap) and related
jobs. PP8 left disconnected

--
Tim Lamb