JB Industries SH-35N Digital Superheat/Sub-Cooling Gauge with Memory/Carrying Case For use in most geographical applications. Pressure display range is 29 in to 600 PSIG (-98 KPA TO 4134 KPA) Temperature display range -40 degrees F to 200 degrees F (-40 degrees C TO 93 degrees C) Operating temperature 32 degrees F to 176 degrees F (0 degrees C to 80 degrees C) Maximum overpressure 800 PSIG (5512 KPA)