Dwyer 477-3-FM Monometer

Intrinsically-safe digital manometer for field calibration, monitoring or troubleshooting HVAC systems, performing clean room inspections, air velocity monitoring, and natural gas appliance-line testingFM-approved intrinsically safe for Class 1, Div. 1, Group A, B, C, D, T4 hazardous locationsAccuracy is + or - 0.5% of full scale at 60 to 78 degrees F, and + or - 1.5% full scale at 32 to 60 and 78 to 104 degrees FPressure measurement units include inH2O, mmH2O, bar, mbar, psi, inHg, mmHg, Pa, kPaNon-volatile memory function provides storage of up to 40 readings, and audible and visual alarms indicate out-of-range measurements

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