• Measures virtually any liquid media compatible with 316L stainless steel
  • Instant selection from up to seven English/metric units
  • Stores 40 readings in memory for later reference
  • Both audible and visual overpressure alarms
  • Operates up to 100 hours on a single 9 volt battery
  • New adjustable dampening feature for averaging fluctuating readings
  • Accurate up to ±0.5% F.S (60 to 78°F)
  • Pressure Hysteresis: ±0.1% of full scale
  • Temperature Limits: 32 to 104°F 4 digit LCD display
  • Two 1/8" (3.18 mm) female NPT connections
  • CE approved


The Dwyer 490 Digital Manometer is a versatile, hand-held, battery operated wet/wet manometer featuring accuracy up to ±0.5% F.S. The 490 is available in several basic ranges for positive or positive differential pressure measurement and can tolerate most liquid media compatible with 316LSS. The instrument includes a memory function that allows storage of up to 40 readings for later recall. A backlight provides auxiliary lighting for hard-to-see locations. Standard are a hold feature and both visual and audible overpressure alarms. A new feature added to the Series 490 is a field adjustable damping. This allows the user to choose the level of display averaging rate corresponding to the fluctuation level common in many applications. A 9V alkaline battery is included that provides up to 100 hours of operation.

The Dwyer 490 manometer is ideal for applications including:

  • Balancing hydronic heating or cooling water loops.
  • Checking pump or chiller performance.
  • Determining pressure head loss from valves and pipe reduction.