IMPROVED DIAL TYPE THERMOMETER OR DIAL TYPE PRESSURE GAUG

摘要

A dial type thermometer or dial type pressure gauge provided with a device for accurately adjusting or setting the pointer to the correct zero reading on the dial without opening the instrument, wherein the said device comprises a circular disc secured in position to the back wall of the instrument case by a central boss concentric with the disc, a movement unit with pointer mounted and fixed on the said disc, a threaded stud fitted on one side of the disc and a screwed  rod  fitted  inside the thread of the said  disc.