Extech 45158 Mini Waterproof Thermo Anemometer and Humidity Meter

  • List Price: $154.99
  • Sale Price: $112.00
  • Amount Saved: $42.99
  • Availability: Usually ships in 1-2 business days



  • Pocket design meter with flip style case acts as extension handle and protects meter during storage
  • Displays air velocity and either relative humidity, dew point or temperature on dual display
  • Measuring range 100 to 5500feet/min
  • Choice of readings in feet/min, meters/second, kM/hour, MPH or knots
  • Rugged water resistant housing floats

Product Detail

  • Product Dimensions: 5.5 x 2.8 x 0.8 inches; 0.01 pounds
  • Shipping Weight: 0.01 pounds
  • ASIN: B00023RVRU
  • Item model number: 45158
  • Average Customer Review: Customer Reviews

Product Description

Waterproof Mini Thermo-Anemometer + Humidity

Model 45158 packs a lot of capability into a pocket size meter that displays air velocity plus temperature or air velocity plus relative humidity on a large, dual display LCD.

Features & Functions Overview

Wind speed values are displayed in six different units (feet/minute, meters/second, kilometers/hour, miles/hour, knots, and Beaufort) with +3% accuracy. Averaging for 2, 5, or 10-second intervals can be selected. Besides air velocity, it also measures wind chill plus relative humidity, and dew point. Additional Functions: Other features include Data Hold to freeze the most recent display, and Auto Power Off to preserve battery life. The 5-1/4" meter folds into a water-resistant housing that is designed to float and when the cover is open. The meter extends to 9" for reaching into openings. You’ll want to carry it with you whether you are on the job as an HVAC or plant maintenance technician or involved in recreational sports.

Inside The Box

  • CR2032 battery
  • 43" (1.09m) lanyard
  • User manual


  • HVAC installation, repair, diagnostics, and optimization
  • Positive pressure tests in clean rooms
  • Fume hood testing, installation, and verification
  • Automobile engines analysis, passenger compartment tests, and aerodynamic testing
  • Ionizer flow output monitoring
  • Ventilation system installation, servicing, and analysis
  • Environmental wind and temperature testing/analysis
  • Boiler rooms
  • Plant/Facilities Maintenance
How Does An Anemometer Measure Moving Air?

Anemometers measure moving air with a rotary sensor that acts very much like a weathervane and can be likened to the blades of a fan. The vane freely rotates in response to airflow, and as the air moves through the vane the blades turn in proportion to the speed of the air.

What Is CFM / CMM?

Cubic Feet per Minute (CFM) or Cubic Meters per Minute (CMM) are units of measure for air volume measurements. This is a measurement of the quantity of moving air through an air duct, passageway, or enclosure. In order to determine this, the area of the duct must be measured. The area value (in ft2 or m2) is entered by the user, by pushbutton or keypad into the meter and an air velocity is determined.

Related Products

Waterproof Mini Thermo-Anemometer

Waterproof pocket size anemometer simultaneously displays Air Velocity and Temperature or Wind chill. Units of measure for Air Velocity include: ft/min, m/s, km/h, MPH, knots, and Beaufort Force. Selectable averaging function of 5, 10, or 13-second intervals. Fold-up protective housing extends to 9" for better reach. Data Hold with Auto Power Off. Tripod mount. Water-resistant housing floats. Includes CR2032 lithium battery and 43" (1.09m) lanyard. Accessories include: Replaceable plastic vane impeller (45156). Package of two.

Heat Index Anemometer

Monitor Heat Index on hot humid days to prevent heat stroke during outdoor activities, sporting events, or in the workplace. Heat Index measures how hot it feels when Humidity is combined with temperature, air movement, and radiant heat. Wet Bulb Globe Temperature (WBGT) considers the effects of temperature, humidity, and direct or radiant sunlight. The AN25 measures Air Velocity in feet/min., meters/sec., MPH, kilometers/hour, and knots, Heat Index, WGBT, Humidity, Temperature, Dew Point, and Wet Bulb. Additional features include: Min/Max/Average (5sec/10sec/13sec), readout in °F/°C, Data Hold, and Auto power off with disable. Complete with CR2032 battery.

Pocket Anemometer

Convenient pocket-sized meter is easy to use and easy to stow. Keep one handy for whenever you need to take a quick environmental measurement. Measures air velocity in ft/min, m/s, km/h, MPH, and knots. It features a large automatic backlit LCD display when meter is powered on, durable double molded side grip, and a tripod mount (optional TR100 tripod). Complete with 9V battery.

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