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645NPT Dual Input Dual Input Differential Manometer with ¼” NPT Fittings


Dual Input Differential Manometer with ± 29 psi range and 0.1 psi resolution. Seven units of pressure: inH2O, mbar, KPa, PSI, mH2O, mmHg, inHg, Auto power off, Record/Min/Max, Backlight display, Zero function, Trim mode to stabilize readings.

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SKU: 645NPT Category: Tags: , , ,


Dual Input Differential Manometer with ± 29 psi range and 0.1 psi resolution.

  • Differential input with + 29 PSI range
  • Seven units of measure (mbar, kPa, PSI, mmHg, inHg, mH2O, inH2O)
  • Display – 4 digit dual line with backlight
  • Smooth – Stabilizes display when measuring fluctuating pressures
  • Data Hold – Freezes reading on display
  • Min / Max – Records Min/Max readings
  • Auto Off – Conserve battery power

The TPI 600 Tuffman series is a hand held range Of pressure meters and can be summarized as follows:

All of these models are dual input differential pressure meters with 7 selectable scales to choose from: mbar, kPa, PSI, inHg. mmHg,inH20, and mH20.

Standard Accessories (Included): 9V alkaline battery (A009A), replacement tubing (A601).


Product Documentationpdf-icon1

Click below to view or download product documentation PDFs:

635 645 655 Manual

645 Data Sheet


 Model 645 Specifications
 Measurement Range ±29 psi
 Display 4 Digit Dual Line LCD with Backlight
 Input Type Dual Differential ¼” NPT fittings
 Resolution (max) 0.01 psi
 Accuracy ±(0.2% Full scale + 3 digits)
 Functions One Touch Zero, Data Hold, Back-light, Unit Selection, Smoothing, Auto power Off, Min / Max Record, Resolution Selection
 Units of Measure 7 Units (mbar, kPa, PSI, mmHg, inHg, mH2O, inH2O)
 Battery Type 9V Alkaline
 Battery Life 80 hours (Typical)
 Auto Power Off 30 minutes
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