Digital Hydronic Manometer Pressure Range +/-300 psi +/-2068 KPA Pressure Resolution 0.001 psi 0.01 KPA Pressure Accuracy +/-1 Percent of rdg Operating Temp Range 40 Degrees to 113 Degrees F 4 Degrees to 45 Degrees C Flow Range (GPM) 0 to 9999 Max Pressure (PSI) 300 PSI 2068 KPA Fluid Temp Range (Deg. C) 32 To 212F 0 To 100C LCD Display Memory 1000 Reading Power Source 4 AA Cell Batteries Battery Life Minimum 12 Hours