K4723 Handheld Digital Manometer Maximum Pressure 100 psi Minimum Pressure 0 psi Pressure Accuracy +/-0.5 Percent Process Connection Size 1/8 in 1/4 in Process Connection Type Compression Includes Batteries Yes Digital Display Features 4 Digit LED NIST Traceable Certificate No Series 477AV Maximum Air Velocity 210 700 fpm Pressure Units psi Air Velocity Accuracy +/-0.5 Percent Full Scale from 60 to 78 Degrees F +/-1.5 Percent Full Scale from 32 to 60 Degrees F and 78 to 104 Degrees F