Protmex HT607 Temperature Humidity Meter High Precision Digital Hygrometer with Ambient, Relative Humidity, Dew Point, Wet Bulb Thermometer, Min/Max Hold, LCD Backlight with Cover Protector

It's largely a matter of faith as to whether any hygrometer is giving accurate readings. There are ways of calibrating them, but these aren't all that reliable for a variety of reasons, like the fact that calibrating at one humidity level doesn't guarantee accuracy at other humidity levels. That's due to the fact that errors are nonlinear (not always off by a constant amount). Errors can be small (or even zero) over some portion of the range and large at others. Most home calibration methods, like the salt method, calibrate at the high extreme of the range, when our concern may be for accuracy elsewhere in the range. That issue is a tough one to get around, but digital sensors seem to have gotten better. In any case, taking any value of relative humidity as the gospel truth is a questionable proposition. What I look for is patterns of change in displayed RH as the environment changes and, to some degree, concurrence among multiple indicators. That's where this unit seems to excel. It gives me a reading that tracks (notice I didn't say "agrees") with other devices I have and with changes in the environment, such as running the heat like crazy and/or running a humidifier. Also, repeat measurements are reasonably stable under unchanging conditions. So, the readings are reliable (notice I didn't say "accurate"). The various bits of information the unit provides are convenient. For example, the dew point is sometimes more informative than the RH. This unit displays that. To sum up, even though I have no certainty that the readings this hygrometer gives me are precisely accurate RH values, I think it does about as well as you can expect in a consumer-grade product. It's consistent, easy to use, easy to read, compact, and affordable. If you need more than that, then you probably should be looking at laboratory equipment rather than something like this hygrometer. I like it and recommend it for most uses outside of a laboratory. It might even be fine in a lab but I'd need further validation tests to know that. In the real world, at affordable prices, in a convenient form factor, I think this is pretty much as good as it gets.

This is only my first day with this product so hopefully nothing goes awry. But so far this instrument is absolutely amazing!! I already have hygrometers with room temp and relative humidity but I wanted more info. I wanted the dew point for a more accurate assessment of the indoor environment. And that's exactly whst I got! The room temp and RH match the other hygrometer readings within ~.5+/- degrees. Amazing! So I feel pretty confident with the accuracy of the readings. I am super happy with this product and would recommended it with confidence.

Works as listed and easy to verify existing temperature/humidity home unit confirming unit is reading and monitoring the home environment is correct.

I was looking for a reasonably priced calibrated meter that could be used to help determine the reliability of temperature and humidity of other devices and appliances. I had a hard time finding devices in this price range that specified that they were NIST (National Institute of Standards & Technology) certified, a benchmark for the reliability/quality of measurements. However, I was impressed that Protmex HT607 Temperature Humidity Meter literature did offer that the device could be evaluated/corrected by engineers for accuracy and reliability (via calibration). It is calibrated during its production. I have only had the Protmex HT607 Temperature Humidity Meter a couple of days, but it has met and exceeded my expectations. The device has done all it has been advertised to do and is quite responsive to ambient environmental conditions. I am currently conducting tests on my Ambient Weather Station Temperature/Dewpoint Array for calibration purposes under various conditions, and the Protmex HT607 Temperature Humidity Meter has helped me build confidence that my weather station array is at least within +/- 1 or 2 degrees Fahrenheit of other temperature/dewpoint sensor monitoring equipment. I am satisfied with the size of the display, the backlight, and the responsiveness of the meter. The meter seems to be durable as well. I have not received any consideration from Protmex and/or Amazon for this review. It is just nice to get a device that actually does what it is advertised to do.

Ottimo leggero e preciso molto pratico

todavia lo he usado poco pero lo medido es correcto y tiene muy buena calidad precio

I like the ability to turn on the back-light and leave on so can monitor for extended periods without have to reset. Temperature cupfates in seconds, humidity about a minute or a little more depending on how big a change. Temperature I found dead accurate when tested against other instruments. Humidity a bit off but very acceptable. Quality feel and clear display.

We survey buildings for energy management purposes as part of out work. I purchased 2 of these and tested their accuracy against 4 other temperature/humidity devices that I have, one of which has been professionally calibrated. They were spot on to within 0.1 degrees centigrade. The humidity was also within 1-2% of the calibrated device. The price is good and they appear well made. With the proviso that I have not used them in the field yet, I am pleased with these devices.

Erstaunlich präzise. Luftfeuchte ist plus minus 1 prozent daneben, Themperatur 1 grad. Wirklich gut.