BTMETER Digital Anemometer Barometer Handheld, for Wind Speed Temperature Wind Chill Tester w/Humidity, Altitude, Barometric Pressure Meter for Climbing Drone HVAC CFM BT-100WM

Overall, the unit is a great value (features to price). The barometer has tracked perfectly with a nearby airport since I bought it. The wind speed (when compared to a more expensive device) tracked perfectly (and with shocking precision). Users need to understand that you can't walk from indoors to outdoors and get an immediate accurate outdoor temp. You need to let the unit acclimate to the new environment for precise readings - but again, the device tracked accurately with other gear. I've done limited testing on the dew point, but the few samples were all accurate. I don't believe I fully understand the ALT (presumed altitude) capability - so it is the only aspect I dislike (the manual is useless on this point). It came with a neat little carrying case (unexpected). Overall - I think this is a good deal!

Very pleased with this unit. Well built and easy to read. A must for those who like to monitor weather and even help with forecasting. The instructions are not the greatest (why I took "Easy to use" rating down a star)...you can download the PDF of the manual to make it easier on the eyes though it is the same as the instructions that are included. Practice a lot with the buttons and options first, and get a good understanding online of relationship between altitude/elevation and barometric pressure, and how to correct for sea level readings that are often what is published online regardless of your elevation. Recommend leaving your BTMETER set for your altitude and correct for sea level manually,

I bought this to use while sailing, both for wind speed and barometer readings for weather forecasting. It does both those tasks well enough. However, it comes with about the poorest user's manual I've ever seen. The one feature that most interests me is the ability to record barometer trends, but the manual only mentions it without explaining how it works. Useless! In the specifications section, there is a table of altitude vs. pressure, but without any indication of the units that are used. (They are meters and millibars.) It would also be nice to have some idea how long a set of batteries will last. The manufacturer should spend a few bucks and get someone who has something more than a Sesame Street grasp of the English language to write the manual. Aside from the documentation issue, I like the product and would recommend it. UPDATE: I ran some checks on this unit and found the following: The battery indicator is misleading. Using the supplied batteries (carbon-zinc, not alkaline - throw them away!), the battery indicator showed zero bars (discharged) after about 10 hours, but the unit continued to run (it does NOT shut itself off automatically) for nearly three more days. During that period, I periodically copied the stored barometer settings into an Excel spreadsheet and plotted the results. Contrary to what is said in the manual, the unit records the barometric pressure HOURLY as long as it is turned on, not every two hours as the manual states. The most recent reading is stored in register one, and earlier readings are shifted up one place when the new data point is stored. So, assuming the unit was powered on for the period of testing, the data in register 16 would be 16 hours old, and the data in register 5 would be five hours old. When I replaced the batteries, the stored data did not disappear, nor did the barometric calibration change. There is no obvious way to clear old data. When the unit is off, no changes to the stored data are made. When the batteries reach a certain discharge level, the backlight will no longer illuminate, and the screen will display "Er2" instead of the usual data. That's your cue to change batteries. When attempting to calibrate the barometer, the settings are made in millibars, not inches of mercury. So, if you know your local barometric pressure, you have to convert it to millibars to get the reading right. (1mb = 0.03"Hg, and 1013mb = 29.92"Hg) If you plan to use the instrument at sea level, and you are somewhere higher than sea level when you do your calibration, you can adjust your local barometer setting downward by 1mb or 0.03"Hg for each 30 feet above sea level your are at the moment. For example, my local barometer setting is 29.92 and I am 150 feet above sea level. I therefore set my barometer to 1008 mb (1013 - 150/30, or 29.92 - 0.15"Hg.) get 29.77"Hg at my elevation. If I then go down to sea level, the pressure will rise to agree with the local barometric pressure. The altitude readout on the instrument is effectively useless because there is no easy way to determine sea level pressure ahead of time, so the altitude reading won't be corrected for sea level pressure. The issued cited above would be problematic for a professional-grade instrument, but, for the price of this unit, you can easily ignore the problems and you can still get useful info. Enjoy!

Works great

I bought this meter with the idea that I would be able to go outside and get an accurate reading of weather conditions in a relatively short period of time. However, the temperature gauge in this unit is EXTREMELY slow. The reading inside my home was 72 degrees, verified by 3 digital thermometers around the house. I checked Weather Underground to see the temps on the various weather stations within a couple mile radius, and they all read 59 or 60 degrees. I went outside to test this out, and the temperature moved less than a degree in 2 minutes, so I left it outside and came back and checked it periodically. It took 20 minutes for it to get down to 59 degrees. I brought it back inside and set it on the table beside me and watched it constantly, and it took it another 20 minutes to get back up to room temp. It should not take 20 minutes for it to adjust itself to a climate change of only 12 degrees. That makes it unusable if you are using it for HVAC systems at a minimum, and basically useless if you want a quick weather reading from outside. I can't imagine how long it would take to go from room temp to winter temps if you wanted to check that. I don't know if I have a bad unit or if this is normal, but either way, it doesn't seem very useful unless you're only concerned with wind speed or have the disposable time to let itself acclimate to a new climate for 20 plus minutes. I would really hope this is not indicative of anemometers in general. Very disappointed. Additionally, the documentation is poor as others have stated, and it does not remember units. It always defaults to metric when switching between settings. The display has an upper reading and a lower reading. The upper reading is for wind speed or barometer, the lower for temp or altitude. So for example, if you go to wind speed, you have to press the button 5 times to get to MPH. If you then check the barometer and then go back to wind speed, it doesn't remember the unit, so you have to press it 5 times again to get back to MPH. Same thing when you switch between temp and altitude, it doesn't save the temp units. I consider that a poorly designed device. Very hard to believe that this is the #1 best seller.

Ottimo strumento multimisura, anemometro barometro altimetro etc.

Eine sehr schnelle Lieferung in einer sehr guten Verpackung! Die Ware ist von sehr guter Qualität und entspricht haargenau der Beschreibung! Ich bin absolut zufrieden und würde die Ware jederzeit wieder kaufen!!

Ça aide à évaluer les conditions pour mon drone qui est capable de fonctionner jusqu'à 35km/h. Bonne petite machine.

Pour la vitesse du vent, ca va bien , lecture rapide et semble assez précise. La lecture de température est lente. Le baromètre donne les bonnes valeurs mais manque de précision (decimales ) pour calculer l'altitude qui devient très approximative . Le baromètre a besoin d'être calibré, donc besoin d'une référence sinon inutile

Düşük rüzgarlar da maalesef çalışmıyor 1 knot altı. :( diğer rüzgarlarda iyi