XS Scuba's Pressure Gauge is a highly accurate Bourdon tube designed gaugewith a built-in thermometer. Gauge has red highlighted readings from 0 to 500psi for safety reserve air with a full-scale readout of 0 to 5,000 psi.Thermometer needle is brightly colored for ease of reading and the entiregauge face is luminescent for ease of reading in low light or night divingconditions. Gauge comes complete with air spool including O-rings. Thepressure gauge measures (Dia. x Depth) 2.32" x 0.95" (5.9 cm x 2.4 cm).