The GrayWolf Zephyr III has exceptional low-end accuracy, yet a wide range. Auto-ranging ΔP sensors, combined with auto-zeroing make this the top performing handheld micromanometer on the market.

• Differential Pressure accurate to 0.1 Pa, 0.002 inH2O (switchable units)
• Broad range ±10,000Pa, ±40 inH2O
• The built-in DP sensor module is both autozeroing and auto-ranging for unparalleled true resolution, accuracy and range
• Measure Air Velocity & Volume Flow with the exceptionally accurate (+/- 2% RDG) optional thermal anemometer
• Alternatively, connect Pitot-Static tubes to measure broad-ranging airspeeds, over wide °C/°F ranges
  
  And more...