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Guide

BTMETER BT-100 vs TopTes TS-301: Which Handheld Anemometer?

Two vane anemometers at similar money that emphasise different things. One publishes its accuracy and adds a tripod mount; the other adds a humidity sensor and a much larger screen.

By the Akermin Editorial Team · 3 min read

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Short answer: take the BT-100 if you want a published accuracy figure, fine resolution and the option of mounting it. Take the TS-301 if you want humidity alongside wind speed and the largest, clearest display of the two.

What Each Listing States

Item BTMETER BT-100 TopTes TS-301
Wind speed range 0.67 to 67.1 mph Not stated in the bullets
Wind speed accuracy Plus or minus 2 percent of reading Not stated in the bullets
Resolution 0.1 m per second Not stated in the bullets
Units Five: m/s, km/h, ft/min, knots, mph Six: ft/m, ft/s, mph, knots, km/h, m/s
Temperature -10 to 60 C, plus or minus 2 C -4.0 to 140.0 F
Humidity Not stated 0.0 to 99.9 percent RH
Extras Wind chill, eight vanes, two temperature sensors, tripod thread 2.26 inch backlit LCD

Published Accuracy Is the Deciding Specification

Anemometers are easy to build badly and hard to check. A vane that starts turning too late reads zero in gentle airflow, which is exactly the range HVAC balancing cares about. The BT-100 listing addresses this with a stated starting speed of 0.67 mph, an accuracy of 2 percent of reading and a resolution of 0.1 m per second, and it attributes low speed sensitivity to eight vanes rather than the usual smaller number.

The TS-301 publishes no wind speed range or accuracy in its bullets. That does not make it inaccurate, but it means you cannot compare, and for an instrument bought to produce numbers that is a meaningful gap.

Turning Velocity Into Airflow

Neither meter measures volume flow directly. Both measure the speed of air at the vane, and volume is that speed multiplied by the area it passes through. The BT-100 listing spells this out. Two practical cautions: measure the free area of a grille rather than its outside dimensions, and take several readings across the face because velocity is never uniform. A single centre reading on a diffuser typically overstates the flow.

Why Humidity on an Anemometer Is Useful

The TS-301 adds relative humidity, which is more relevant than it first appears. Supply air humidity, the moisture in a crawlspace being ventilated and conditions in a grow space are all questions that come up at the same moment as airflow. Having both on one screen saves a second instrument. The listing’s warning that the sensors may need 30 minutes to acclimatise is worth respecting: bring the meter into the space, put it down and let it settle before recording a humidity number.

The Tripod Thread Is Quietly Useful

A mounted anemometer records conditions while you do something else, which suits drone flying, shooting and any situation where you want to watch a trend rather than take one reading. It also removes the problem of your own body disturbing airflow, which matters more in duct and grille work than most people realise.

Who Buys Which

  • HVAC balancing and duct work: BT-100, for the published low speed capability and accuracy.
  • Outdoor use, drones, sailing, shooting: BT-100, for the tripod thread and wind chill.
  • Wanting humidity in the same tool: TS-301.
  • Poor eyesight or bright site conditions: TS-301, for the 2.26 inch backlit screen.

How We Research

All figures come from the manufacturer listings. We did not run laboratory tests and publish no measurements of our own. Ranking in the anemometer roundup.

BTMETER BT-100 Handheld Anemometer, Digital Wind Speed CFM Meter Gauge Air Flow Velocity Tester for HVAC Shooting Drone, Wind Chill, 14℉-113℉ Wind Temperature

BTMETER BT-100 Handheld Anemometer, Digital Wind Speed CFM Meter Gauge

View on Amazon
TopTes TS-301 Digital Anemometer, Wind Speed Meter with 2.26-inch Big Backlight LCD Screen, Air Flow Meter for Sailing Surfing Drone Flying RC Plane Golf Shooting HVAC

TopTes TS-301 Digital Anemometer, Wind Speed Meter with 2.26-inch Big

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Extech EN300 5-in-1 Environmental Meter - Measures Air Velocity, Light, Humidity, Temperature & Sound Level - Compact Multi-Function Tester with Large LCD & Data Hold for Field and Indoor Monitoring

Extech EN300 5-in-1 Environmental Meter - Measures Air Velocity, Light,

View on Amazon

Products shown because their documented specifications fit this guide. Price and availability are on Amazon and can change.

Frequently Asked Questions

Which publishes an accuracy figure?

The BT-100, which states wind speed accuracy of plus or minus 2 percent of reading across 0.67 to 67.1 mph, temperature accuracy of plus or minus 2 C and a resolution of 0.1 m per second.

Does either measure humidity?

The TS-301 states a temperature and humidity sensor with a relative humidity range of 0 to 99.9 percent, and notes the sensors may take at least 30 minutes to acclimatise to a new environment.

Can I calculate airflow in CFM?

Both are velocity meters. The BT-100 listing gives the relationship directly: airflow equals wind speed multiplied by duct cross sectional area. Measure the duct, multiply, and keep your units consistent.

What is the tripod thread for?

The BT-100 states a metal threaded hole on the base for mounting, so the meter can be left recording wind conditions while your hands are free, which suits drone flying and shooting as well as fixed airflow checks.

Affiliate disclosure: Akermin earns a commission from qualifying Amazon purchases made through links on this page. Our editorial picks are based on documented specifications and owner feedback, not commissions.