Buy Oregon Scientific THGR122NX Wireless Temperature and Humidity Sensor

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List Price: $40.00
Sale Price: $32.75
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This Oregon Scientific THGR122NX sensor is OK. It reports data back to my base station steadily, and so far in the four months I have had it, the unit has worked reliably. For indoor usage where temperature and humidity don't vary too quickly, I think this would be a fine unit. I used some humidity calibration standards and the sensor readings can be accurate if you are willing to wait for the sensor to stabilize over about 12-24 hours.

My main complaint is that the humidity sensor is not very accurate for typical outdoor use. I live in a climate that gets hot and humid summers. At night time, the humidity almost always goes to nearly 100%, and in the day time it can be quite humid too (70%). It would be nice to have an accurate outdoor sensor to know when it would be pleasant to open the windows without letting in too much humidity.

The first problem is that the sensor's reported humidity level hits a maximum at about 88%. Anything above this reading indicates total saturation. Loss of sensor range is fail.

The second problem is that once the sensor has been saturated, it takes some to dry out. This is known as hysteresis. The true humidity may be dropping, but the THGR122NX reports the same value for an hour or more. This is important when the outdoor humidity is changing quickly in the day-night cycle. Sensor readings can be off by more than 10%; calculated dew points can be off by 5-10 degrees F.

The sensor is probably good for indoor use where we normally don't let the humidity get very high, or to change very quickly. But for outdoor use it just can't cope very well with high humidity or naturally changing conditions.

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Product works as expected. From my experience Oregon Scientific Weather Stations are one of the best. The batteries last over a year and they are very accurate. After comparing different brands that people I know had I settled on a Oregon Scientific BAR388HGA and am very satisfied with it. I bought this sensor mainly to monitor the temperature in a second floor room. The sensor is approximately 60 feet away, up one floor and through several wall from the main unit, and it work very well.

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Overall decent product and displays. Loved the unit for about three months, then the sensor stopped transmitting. Changed batteries, reset, changed batteries again. No luck except when sensor is within 6 inches of base. Poor sensor makes this worthless.

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All of the wireless weather gear I have purchased over the last 10 years from Oregon Scientific performed superbly and this sensor is no exception! It is easy to set up, accurate and reasonably priced. It is also fully backwards compatable with older model systems (400 Mh)

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Overall I'm happy with this purchase. It works as advertised and was pretty easy to setup / configure. I have 2 sensors setup so I can see the outdoor temp and the temp in my baby's room. One thing that really irritated me was that the remote sensors don't display the same temp. What I mean by this is that when I had both sensors side by side they were 2 degrees off in temp and humidity. They were placed 12 inches apart in the same room so that I could set them up and see how this all worked. I called the mfg and they told me that this is normal and that no 2 thermometers will ever display the same temp. I guess I just have to deal with that.