BTMETER BT-100 vs BT-100APP vs BT-100WM: Which Wind Meter?

Open the BTMETER BT-100 on Amazon and you can switch between three models: the BT-100, the BT-100APP and the BT-100WM. They look almost the same, but they are different tools. The APP version sends readings to your phone; the WM version adds humidity, dew point, pressure and altitude. Here is the difference, from BTMETER's own manuals and listings, and which one fits what you want to measure.

Editorial Research

Written by

Lena Thornton, Weather Station Analyst & CWOP Contributor

Based on

BTMETER's instruction manuals for the BT-100, BT-100APP and BT-100WM and their Amazon listings (ASINs B07J64TCBQ, B07JVNYNB3, B07JBW8VPX), read October 22, 2026

Hands-on testing

Not performed by The-Weather.com

Research last verified

October 22, 2026

This page contains affiliate links: we may earn a commission if you buy through them, at no extra cost to you.

Side by Side

Feature	BT-100	BT-100APP	BT-100WM
Wind speed	5 units, ±5% (manual)	5 units, ±5%	5 units, ±5%
MAX / MIN / AVG	Yes, AVG over 15 s	Yes, AVG over 15 s	Yes
Temperature	14-113 °F, ±3.6 °F	14-113 °F, ±3.6 °F	14-113 °F; the listing says "+/-2 ℃/℉", which is unclear
Wind chill	Symbol below 32 °F	Symbol below 32 °F	Shown as a value in °C or °F
Humidity and dew point	No	No	Yes; dew point 32-122 °F; humidity range and accuracy not stated
Barometric pressure	No	No	Yes, inHg or hPa/mbar, with calibration; stores 16 readings (one every 2 hours); range not stated
Altitude	No	No	0-19,685 ft (0-6,000 m), calculated from pressure
Phone app	No	Yes, "Intelligent Anemometer" for iOS and Android; log and export (.xls, .txt)	Not mentioned
Auto power off	Listed, no time given	Adjustable; set to 0 to stay on	After 10 minutes (listing); not in barometer mode (manual)
External power	Not mentioned	Power input on the right side, for an adapter below 12 V; adapter not in the box list	Not mentioned
Tripod hole	Yes, 1/4 inch	Yes, 1/4 inch	Yes
In the box	Meter, 2 AAA, neck strap, carry bag, manual	Meter, lanyard, small screwdriver, carrying case, 2 AAA, manual (BTMETER's FAQ)	Manual listed; rest not specified

From BTMETER's manuals, listings and FAQ answers on those listings. One BT-100 listing bullet claims ±2% wind accuracy, but its manual, its spec box and the other two listings say ±5%. "Not mentioned" or "not stated" means neither the manual nor the listing describes it.

BT-100: The Simple One

Six buttons, wind speed and temperature, MAX/MIN and a 15-second average. Good for a quick check of an air vent, a drone or kite session, or a windy day. Everything about it: BT-100 review and BT-100 manual.

BT-100 on Amazon

BT-100APP: Readings on Your Phone

Same meter, plus Bluetooth. According to the BT-100APP manual, you install the app by scanning the QR code in the manual, switch the meter on, turn on Bluetooth on your phone, and a green light shows when they are paired; then you press start in the app. BTMETER's FAQ names the app "Intelligent Anemometer" (iOS and Android only) and says data can be exported as .xls or .txt. Two practical extras: the auto power off time is adjustable (0 means it stays on), and there is a power input for an adapter below 12 V (our view: handy for long sessions on a tripod). The adapter is not in the box list, so you supply your own.

Check before you buy: the app only runs on iOS and Android phones and tablets, and all data goes through it; BTMETER says exported files go from the phone to a computer.

BT-100APP on Amazon

BT-100WM: A Small Weather Meter

The WM version is the one to pick when wind is only part of the picture. Besides wind speed and temperature, it shows relative humidity, dew point, wind chill, barometric pressure and altitude. You can calibrate the pressure to your local reading, and it stores 16 pressure readings taken every 2 hours, so you can see the trend over about 30 hours (our arithmetic).

Altitude moves with the weather: the WM calculates altitude from air pressure. The manual warns that changes in air density caused by the weather lead to a different altitude reading at the same spot, so recalibrate the pressure to your local reading before you rely on it. BTMETER gives no range or accuracy for humidity. It has no ballistics or density-altitude features; for long-range shooting with built-in ballistics, see our Kestrel 5700 Elite review. Our barometric pressure converter explains inHg and hPa.

BT-100WM on Amazon

Which One Should You Buy?

• You only check wind or air vents now and then: the BT-100. Nothing to pair, nothing to calibrate. For airflow, see how to measure CFM.
• You want a record of readings, or measure for longer on a tripod: the BT-100APP. Logging and export run through the phone app, and the external power input saves batteries.
• Humidity, dew point, pressure or altitude matter too (hiking, weather watching, basic shooting): the BT-100WM. It has no ballistics; for that, see the Kestrel 5700 Elite.

All three share the same wind speed range and ±5% margin, so pick on features, not on accuracy.

BT-100 Versions FAQ

Update Log

• October 22, 2026: First version, based on BTMETER's three manuals and listings.

Sources

• BTMETER: BT-100 instruction manual (PDF)
• BTMETER: BT-100APP instruction manual (PDF)
• BTMETER: BT-100WM instruction manual (PDF)
• Amazon listings for the BT-100 (B07J64TCBQ), BT-100APP (B07JVNYNB3) and BT-100WM (B07JBW8VPX), read October 22, 2026