Now and then things are unearthed in the garage and you have no idea what they were actually originally used for/what the design application is - a case in point with these Dwyer Instruments Inc Magnelic Inches of Water gauges.

Max pressure 15 PSIG max temperature 140F.

I haven't found out much about them but other Dwyer gauges are not apparently cheap presumably due to their specialist application and these are tough diecast gauges - NB both appear to have drill marks in the 10 o'clock position on the back - see photo - not broken through but I don't know if this is important/just a fact of their removal from their original application. Otherwise they are in very good cosmetic condition but obviously untested.

Please note I can reduce the UK shipping cost pro rata if both are bought at the same time.