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| Item | Handheld Digital Manometer |
| Accuracy | -0.5% to +0.5% |
| Auto Power Off | Yes |
| Batteries Required | Yes |
| Battery Type | 9V |
| Connection Type | Hose Barb |
| Display Digits | 4 Digits |
| Display Type | LCD |
| For Use With | Air |
| Housing Height | 5 7/8" |
| Housing Length | 2.812" |
| Housing Material | Aluminum |
| Intrinsically Safe | Yes |
| Length | 0.906" |
| Low-battery Indicator | Yes |
| Max. Operating Pressure | 10 psi |
| Max. Pressure | 10 psig |
| Nist Traceable Certificate | No |
| Number Of Connections | 2 |
| Operating Pressure Range | 0 in. wc to 20 in. wc |
| Operating Range | 0 in. wc to 20 in. wc , 0 kPa to 5 kPa |
| Operating Temp. Range | 0°F to +140°F |
| Overall Height | 6 1/2" |
| Overall Width | 2.812" |
| Pressure Accuracy | -0.5% to +0.5% |
| Pressure Range | 0 in. wc to 20 in. wc |
| Pressure Type | Differential, Negative, Positive |
| Pressure Units | In Wc |
| Process Connection Type | Hose Barb |
| Resolution | 0.01 in. wc |
| Type | Intrinsically Safe Manometer Unit |
| Zero Button | Yes |
| Connection Size | 1/8", 3/16" |
| Connections | 1/8" Hose Barb, 3/16" Hose Barb |
| Digital Display Features | 4 Digit LED |
| For Tubing Diameter | 1/8", 3/16" |
| Includes Batteries | Yes |
| Intrinsically Safe Safety Rating | Class I Div. 2 Group A, B, C, D |
| Low Battery Indicator | Yes |
| Manometer Type | Intrinsically Safe Manometer Unit |
| Manufacturers Warranty Length | 1 yr. |
| Maximum Operating Temperature | 140°F |
| Maximum Pressure | 20 in. wc |
| Minimum Operating Temperature | 0°F |
| Minimum Pressure | 0 in. wc |
| Number Of Pressures Measured | 1, 2 |
| Overall Length | 0.906" |
| Pressure Resolution | 0.01 in. wc |
| Process Connection Size | 1/8", 3/16" |
| Series | 475 Series |
| Standards | CLASS I, DIV 1, GROUP A, B, C, D, T4 |
| Storage Temperature Range | -4°F to 176°F |
| Type Of Pressure | Differential, Negative, Positive |
| Weight | 10.8 oz. |
| Ship weight (kg) | 0.33 |
| Ship height (cm) | 3.3 |
| Ship length (cm) | 25.4 |
| Ship width (cm) | 12.7 |
| HS code | 9026208000 |
| Country of Origin | US |
Dwyer 475-1-FM handheld manometer is suitable for air & gas differential pressure measurement in boilers, combustion equipment and HVAC system operations. It measures positive, negative or differential pressures of air and natural gases.
A. The most common fluids are alcohol, water and mercury.
A. Because of its low density, alcohol allows for a longer column than other fluids in manometers. It also gives the inclined tube a proper meniscus.
A. Manometers are used to measure pressure which is defined as the force produced by a gas or liquid per unit of surface area due to the effects of gravity on the weight of that gas or liquid.
Contact your account manager right away to get personal advice.
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Trade pricing is available for 
Order Value should be £500+