Davis 271 [271] Turbo Meter Electronic Wind Speed Indicator, (Pack of 3 pcs)

The Davis Instruments 271 Turbo Meter provides uncommon accuracy, sensitivity, and pocket-sized convenience. It is based on the principle that a freely turning turbine will rotate at a speed directly proportional to the wind speed. To insure maximum sensitivity and accuracy, the turbine is suspended on sapphire jewel bearings, and its rotation is sensed by an infrared light beam which adds no friction. The resulting signal is processed electronically by an LSI (Large Scale Integrated) circuit for improved reliability and reduced size. A special three digit display is used for extra resolution and provides excellent viewing contrast in bright sunlight. A handy switch selects between four different scales - knots, feet per minute, meters per second, and miles per hour - for unmatched versatility. The Davis 271 is compact and light weight. Measures wind speed from 0 - 99.9 mph.

Features:

• Knots
  • Range: 0-87.9
  • Resolution: 0.1 knots
  • Threshold: 0.9 knots
  • Accuracy (% of reading): +4%, -2% or ±0.1 knot (whichever is greater)
• Feet Per Minute
  • Range: 0-8790
  • Resolution: 10 FPM
  • Threshold: 90 FPM
  • Accuracy (% of reading): ±3% or ±10 FPM (whichever is greater)
• Meters Per Second
  • Range: 0-44.8
  • Resolution: 0.1 m/s
  • Threshold: 0.5 m/s
  • Accuracy (% of reading): ±3% or ±0.1 m/s (whichever is greater)
• Miles Per Hour
  • Range: 0-99.9
  • Resolution: 0.1 MPH
  • Threshold: 1 MPH
  • Accuracy (% of reading): ±3% or ±0.1 MPH (whichever is greater)
• Averaging period for wind speed measurement
  • Knots (FPM): 1.5 seconds
  • Meters Per Second: 0.75 seconds
  • Miles Per Hour: 1.625 seconds
• Bearing Type: Sapphire jewel bearings
• Power requirements: 3 AAA alkaline batteries
• Battery life: Typically 7 hours (intermittant service)
• Weight (without batteries): 3 oz (85 g)
• Dimensions:
• 1.16" x 2.60" x 4.65" (29.5mm x 66mm x 118mm)

What's In The Box:

• (1) wrist lanyard
• (1) Protective vinyl case
• (3) 1.5 V AAA batteries

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