Needed something to do with this corona virus stay at home order so picked up a Calypso J regulator to rebuild. Read previous posts which were very helpful. WIth the regulator came this submersible pressure gauge. It still works showing correct tank pressure. It looks to have rotating bezel on the outside which does not seem to move? Some of the numbers relate to the S.Rate ? PSI/Min ? I can not read the brand name on the inside.
Any help in identifying it and info on how the bezel is suppose to work is appreciated.