Handheld Digital Manometer

Series 475 Mark III


Ranges to 30 psid, 2.07 bar, ±0.5% Accuracy


- Measures Positive, Negative or Differential Pressures
   up to 30 psid (4.97 kPa).

- Large Easy-to-Read 0.5" LCD Display.

- Dual Metric/English Pressure Units. Eliminates Errors
   in Converting.

- Barbed Connections Fit Both 1/8" and 3/16" I.D. Rubber
   or Vinyl Tubing.

- Includes + and - Indicators plus Low Battery Warning.

- Operates up to 100 Hours on one 9 Volt Battery.

Series 475 MK III Handheld Digital Manometers are ideal for field calibration, monitoring or trouble shooting HVAC systems, clean rooms or a wide range of other low pressure pneumatic systems.
Large, 1/2" LCD display is easy to read - even in the poorest lighting conditions, minimizing data collection errors.
A single key instantly switches readout between English and metric pressure units so you don't have to calculate equivalents.
Durable extruded aluminum housing provides complete protection for electronics. One-piece front membrane keeps dust and moisture out ; wipes clean in seconds.
Zero adjustment is conveniently located on top, no tools necessary.


Model Number

English  Range

Metric Range

Maximum  Pressure


0-19.99 in. w.c.


11 psi/75 kPa


0-40 in. w.c.

0-9.95 kPa

11 psi/75kPa


0-199.9 in. w.c.

0-49.7 kPa

11 psi/75 kPa


0-10.00 psi

0-0.689 bar

58 psi/4 bar


0-19.99 psi

0-1.378 bar

58 psi/4 bar


0-30.0 psi

0-2.07 bar

58 psi/4 bar

Accuracy:                                                          ±0.5% of full scale, 60 to 78°F (15 to 25°C)
Pressure Hysteresis:
                                        ±0.1% of full scale
Temperature Effect, Zero Reading:                     
0.5% of full scale, 32 to 122°F (0 to 50°C)
Operating Temperature Range:                          32 to 122°F (0 to 50°C)
Maximum Pressure:                                           See chart
Power Source:
                                                  9 volt alkaline, included
Pressure Connections:                                      Barbed for 1/8" or 3/16" I.D. tubing
Battery Life:
                                                       Typically 100 hours
Display:                                                              0.5" liquid crystal
6 9/6"H x 2 13/16"W x 29/32"D (166x71x23 mm)
Weight, Battery Included:                                    12 ounces (340 grams)

A-402 Carrying Pouch - Tough gray nylon pouch protects any Series 475 or 477 manometer and includes convenient side compartment for tubing and other accessories. Both areas are fully zippered for easy access. With belt loop, hand strap and adjustable shoulder strap. 7" x 4 1/2" x 3" (178x114x76 mm).



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