The Dwyer 475-3-FM Series 475 Mark III Handheld Digital Manometer is an intrinsically safe digital manometer designed to measure positive, negative, or differential pressures of air and natural gases from 0 to 200.0 in. w.c. Housed in durable extruded aluminum, it features dual push-button operation, a clear LCD screen, dual hose barb pressure ports, and an attached wrist lanyard for handheld field testing and HVAC diagnostics.
This unit was inspected and tested by inserting a standard 9V battery and powering on the LCD display. The digital readout activated clearly and zeroed to 0.00 as shown in photos. No pressure calibration or gas flow testing was performed. The manometer exhibits light cosmetic surface wear from routine handling and storage.
Please refer to the photos for more information.
This unit only includes what is photographed in the listing.
Made in USA.
Technical Specs
| Item | Handheld Digital Manometer |
| Connections | 1/8 in Hose Barb; 3/16 in Hose Barb |
| Manometer Type | Intrinsically Safe Manometer Unit |
| Pressure Range | 0 in wc to 200 in wc |
| Pressure Accuracy | ±0.5% |
| Pressure Units | in wc |
| For Tubing Diameter | 1/8 in; 3/16 in |
| Housing Material | Aluminum |
| Intrinsically Safe | Intrinsically Safe |
| Low Battery Indicator | Low Battery Indicator |
| NIST Traceable Certificate | No NIST-Traceable Calibration Certificate Included |
| Pressure Resolution | 0.1 in wc |
| Process Connection Type | Hose Barb |
| Series | 475 |
| Process Connection Size | 1/8 in; 3/16 in |
| Pressure Measurement - Maximum | 200 in wc |
| Pressure Measurement - Minimum | 0 in wc |
| Operating Temperature - Maximum | 140 °F |
| Operating Temperature - Minimum | 0 °F |
| Country of Origin | USA |
| Digital Display | LCD |
| Maximum Pressure | 30 PSIG |