Tridicator(boiler gauge) 3" dial,black steel case,chrome ring, glass window,1/2"NPT ... or bottom. Tridicator:One gauge measures both temperature and pressure.3" dial,black steel case, chrome ring,glass window,brass wetted parts ... ,dual scalesRange:0-75psi/kPa,30-240F/CAccuracy: pressure ±3-2-3%,temp.±2%***Other ranges or thread size available upon question ...