4-Pack Mini Digital Hygrometer Thermometer Gauge with Probe LCD Display Temperature Fahrenheit Humidity Meter for Incubator Reptile Plant Terrarium Humidor Guitar Case

The display portion of this instrument reaches out to the sensors via a cable (about 4 feet long), making it possible to measure, for instance, the temps in a 'fridge. It is surprisingly tiny, but the display is still easy to read. The display can be mounted by using the included suction cup or the two sticky pads. The unit responds reasonably quickly. It took less than 5 minutes for it to match my much larger unit to within 1% of hunmidity (46%/47%), and 2 degrees of temperature (76/78). I have no way of telling which unit is "off". Maybe they are both off! Naturally, being from china, neither this or my big unit came with accuracy specifications. Or any specifations, for that matter.If you need to measure humidity and temp, it's hard to ignore this unit. Inexpensive, small and easily hidden, it works good enough for most non-laboratory applications. And because you get two for the price of one for roughly the price of a cup of coffee these days, it is affordable...if you but skip one morning's cup, that is!

I prefer the probe gauges rather than the sticky ones. Seems pretty accurate.

Good little thermometers, humidity is a little off.So as long as you know that from the get go you're good

Before use I monitored both instruments for a few days and compared them to a lab grade thermometer as a reference standard. The thermometers were almost always in exact agreement, and never more than 1° different for a brief period, and always within a degree of the standard. The relative humidities usually agreed and never varied by more than 2% from each other.I used these to monitor my car's underhood temperatures, with the readouts pinned down with the wipers. I had no problem reading the temps while driving, so I'd say they're easy to read.Well worth the price.

These are nice compact, easy to read units, but are not accurate. I didn't read the other reviews before placing my order.I compared these side by side along with another thermometer/hygrometer I have for my home use. Comparison was made in a large, vaulted ceiling room; a bathroom full of steam from the shower; and a small vivarium enclosure where they were ultimately needed. The temperature was always spot on +- 1 degree. The humidity was all over the place typically showing 10 percent higher that actual humidity which could be detrimental in my vivarium.The return/refund process was quick and easy.

These devices have been working extremely well for me. The displayed temperature and RH for these two devices were almost always identical and when they deviated the deviations were either 1 degree for temperature and 1 to 2 % for RH, both well within the stated specifications. When I compared the displayed values with a more expensive humidity/temperature monitor the displayed values, again, were either identical or within 1 degree for temperature and 1 to 2 % for RH, indicating that these low cost devices are accurate well within the published specifications. For example, right now the two devices being reviewed both show 80 degrees F and 23% RH and the more expensive monitor is showing 80 degrees F and 24% RH, so the two devices being reviews are well within the published specification of +/-5% RH.For these devices, when RH increases the response time is very reasonable with a delay of less than about a minute. When RH decreases the response time is much slower than when RH increases and can take multiple minutes steadily decrease and to finally display the new, lower RH value. That type of response delay makes sense based on what I see when I remove the housing for the sensing element. It looks like the sensor is a resistance type humidity sensor and it will take time for the special salt between conductive elements to release moisture when the RH drops and to respond to the RH decreasing. What I believe to be the sensor's data sheet shows that the sensor is a +/-5% RH device and these two temperature/humidity devices are displaying RH that is will within +/-5% RH.Reading reviews it appears that some confusion exists regarding what is considered to be errors in displayed RH. The specification that I see is +/-5% RH. At the limits that specification means one device could be 5% low and the other one 5% high and still be within specifications. For example, if the real RH is 35% then one device showing 30% and another device showing 40% is within specification. I observe that the devices I have have been using are working at what appears to be about +/- 1% RH, which is excellent. For reference, when I checked on other more expensive sensing elements I saw +/- 2 % for the specification.

They are not accurate but seem to be consistent. I use them to know if the temp or humidity is changing not to indicate the actual temp or humidity. As such, they are a good value and a handy tool.

These were ready to go right out of the box and did the job perfectly. Came with an extra set of batteries, too.

They function great for my reptile terrariums since they have both humidity and temperature!Work like a charm!

Bought 4 of these. Put them all together on the counter. 3/4 read identical while 1 was 4% off humidity and 1° off temperature. I can totally live with that. These are especially handy set up in my 3 egg incubators. The fourth is set up in my brooder room. Overall very happy. Id have given 5 stars except the shipping company wouldn't deliver and i had to drive nearly 30km to pick them up.

Working great and accurate

Why are the specs in Celcius if the thing only reads in farencrap? Misleading, cant use it. Not worth returning so I'm out the entire cost to their false advertising

Not 100% accurate, but pretty close. I used this item for an incubator for hatching chicken eggs.