The Series 475 Handheld Digital Manometer measures positive, negative, or differential pressures of air and natural gases in ranges from 1 in w.c. (0.249 kPa) to 150 psid (10.34 bar).


The dual push pads on the front panel control the on/off, auto zero, and pressure unit selection, allowing for simple operation with no set up needed. When used with a Dwyer® Pitot tube, the Series 475 can also be used as an air velocity gage.

  • Service: Air and compatible combustible gases.
  • Accuracy: ±0.5% FS, 60 to 78°F (15.6 to 25.6°C); ±1.5% FS from 32 to 60°F and 78 to 104°F (0 to 15.6°C and 25.6 to 40°C).
  • Pressure Hysteresis:±0.1% of FS.
  • Pressure Limits: See catalog page.
  • Temperature Limits: 0 to 140°F (-17.8 to 60°C).
  • Compensated Temperature Limits:32 to 104°F (0 to 40°C).
  • Storage Temperature Limits:-4 to 176°F (-20 to 80°C).Display:0.42" (10.6 mm) 4-digit LCD.
  • Resolution: See Ordering page.
  • Power Requirements: 9 V alkaline battery, installed non-functional, user replaceable.
  • Process Connections: Two barbed connections for use with 1/8" (3.18 mm) or 3/16" (4.76 mm) I.D. tubing. Two compression fittings for use with 1/8" (3.18 mm) I.D. x 1/4" (6.35 mm) O.D. tubing for 475-7 & 475-8 only.
  • Weight:10.8 oz. (306 g).
  • Compliance: CE, FM approved to Class I, Div 2, Groups A, B, C, D, T4 Ta = 70°C.


  • Air Velocity (-AV)
    Kit includes: Model 475 Digital Manometer, Pitot Tube, two No. A-303 static pressure tips with magnetic mounting, 3/16" I.D. rubber tubing,
    No. A-397 step drill for 3/16" - 1/2" holes in 1/16" increments, No. A-532 AV slide chart, 9 volt battery, and fitted polyethylene case.
  • Examples: 475-1-AV; 475-000-AV
ModelImperial RangeMetrice rangeMaximum pressure
475-000-FM0 to 1.000 in w.c..2491 kPa5 psig
475-00-FM0 to 4.000 in w.c.0.996 kPa5 psig
475-0-FM0 to 10.00 in w.c. 2.491 kPa5 psig
475-1-FM0 to 20.00 in w.c. 4.982 kPa10 psig
475-2-FM0 to 40.00 in w.c.9.96 kPa10 psig
475-3-FM0 to 200.0 in w.c.49.82 kPa30 psig
475-4-FM0 to 10.00 psi.6895 bar30 psig
475-5-FM0 to 20.00 psi1.379 bar60 psig
475-6-FM0 to 30.00 psi2.069 bar60 psig
475-7-FM0 to 100.0 psi6.895 bar150 psig
475-8-FM0 to 150.0 psi10.34 bar 200 psig

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