F007TH

Sends out 433mhz temp/humidity/batt-level signal that's easily decoded by rtl_433. Device has hardcoded (random) house number (mine didn't appear to change when batteries were changed), and switch selectable ID (1,2,3 or 4) so you can have multiple devices and tell which is which. Battery life seems good. Range is about 30-50ft through multiple thick walls/steel siding but depends on radio noise/interference as 433mhz can be busy.

worked great as soon as i put the batteries in

It is accurate and easy to connect but don't sit it in direct sun! I put it on top of a fence post temporarily to connect it and when it did it read 107. Entirely my fault and now it reads similar to other in the area so accuracy is no problem. It simply connects by restarting the little box on the wifi and it showed right up.

I liked the initial kit enough to buy another 5 transmitters to max out the units capacity to a total of 8. (each transmitter sends out both temperature and relative humidity readings). I found the transmitters to all be reasonably consistent and accurate when calibrated with a trusted thermometer and a salt chamber for verifying the RH readings. You can even fine tune each reading on the central display to compensate for any calibration errors if necessary. Mostly I wanted the transmitters to monitor the performance of a multi chambered root cellar, but I also use it for monitoring the efficiency of my HRV system for interior air quality. I live in an ICF house with a lot of concrete walls blocking the signal from the transmitter to the central display. I did finally find a location in the house that could get a signal from all the transmitters. Dont expect much more than 30 feet distance if the signal has to pass through concrete walls and floors. The transmitters work fine from inside a PVC pipe but not at all from inside a metal pipe. Note: only three transmitter displays are fixed. The fourth readout on the central display can be set to continuously scroll through the other 5 transmitters. Each transmitter takes two batteries, so factor in that cost when buying multiple extra transmitters. I think it is a pretty good value for those looking to remotely monitor multiple locations for temperature and relative humidity.

Use to track Basement humidity where we have a dehumidifier and outdoor temperature and humidity

im using this in my solar heated jacuzzi to save me walking out and back to see when to turn off the pump. a strictly manual system.it was less of an issue before my back problems made walking so unfun.i took Ambient's advice and went with this, rather than their pool float sender. i had read many reviews of several makes (including theirs) that pointed to problems with leaking at gaskets. and while Ambient's seemed to deal with it best w/ their double gasketing, mixing electrons (regardless of voltage) with water always plays havoc with electronic devices. this device solves the problem completely.im still contemplating where and how to place it to protect it from rain. it hasnt rained since long before i got it and i still havent seen info about how well this sender tolerates dampness.another complaint with all floating senders is number of batteries required. this unit only requires only 2 AAA. half as many. i havent had it long enough to know how long they will last.my only negative, which relates to my desert environment, is that the wires had been chewed off during the night (most likely by a rat.) i hear they like wiring insulation made of soy protein but who knows? i dont know what material this is anyway. my solution was to run the wire thru an additional conduit. i would have preferred a longer run of wire and may try to cobble something together.im extremely pleased to have this sending me tested accurate information (within a degree) and saving me the steps to get it since therapy was the whole notion anyway.so thanks Ambient Weather!

We bought these to use to monitor air and soil temperatures in our garden and in our rabbit barn. I was really disappointed to discover that they are only accurate within 2 degrees either way - and of course, it didn't say that anywhere in the product description. That's a significant difference when you're trying to measure what difference you are achieving in the air and soil using row covers, cold frames, and hoop tunnels. If you are comparing air temperature in the garden, and air temperature in a cold frame, and they are both off 2 degrees but in different directions, that could be as much as 4 degrees difference. Significant when some types of covers only buy you 4-6 degrees in temperature protection!We bought 8 total sensors, and allowed them all to sit right next to each other for several days before installing, and none of them registered the same temperature.So we thought about trying to make it work anyway - after all, we're just hobby gardeners, not a nursery. Our house is about 80 feet from our garden, and with just one wall or window (we tried both), we couldn't get readings from the sensors down in the garden. Granted the signal also had to go through the twin wall polycarbonate of the cold frame, so I guess that's two obstacles.What the product description also doesn't tell you is that for every obstacle that the signal has to go through, the range is effectively cut in half. So you start with a range of 300 feet, go through a wall and you're down to 150 feet (or more, depending on what the obstacle is made of). Go through another obstacle and the range cuts in half again, so you only get 75 feet. And so on...So our next move was to take the base unit down to the garden and put it inside a rubbermaid bin about 10-25 feet from the various sensors. Still two obstacles to every sensor, but almost no distance. You guessed it, it still didn't keep connection with all the sensors and you have to reset them. Added to that, you have to actually go to the main unit every day to record the min/max for each sensor, maybe not a huge deal since you need to go out to the garden regularly anyway.It is easy to reset them, but if you're recording your min/max temps every morning (for example) and you go out to find that a sensor (or five) lost the signal - you won't get an accurate range, because if it stopped the evening before you won't get a reading for how low the temp went overnight.There are other systems out there that you can buy for not much more money (watch sales). The system we bought to replace this one actually has the air and soil thermometer in each unit, so if you buy eight of those you can actually get up to 16 readings if you're using both the probe and air sensor in each unit!**Update 6/12/14 For those who marked that they don't find the review helpful, I'm sorry that you disagree with a negative review, but that's what the review system is all about! We followed all the instructions, we researched and asked questions, so we know how and why things work the way they do with these types of systems. The negative review wasn't about the temperature variation, it was about the fact that the sensors could not communicate with the base unit, even when we moved the base unit down into the garden with the sensors, so it was within 15-25 feet of each sensor with two thin barriers between each sensor. Based on the specs by the manufacturer, it should have worked, yet we had to reset more than half of the sensors each and every day, no matter what we did.Maybe we got a defective unit - we had conversations with the manufacturer were told that was just the way it was, and it wasn't defective by their definition, even though it didn't work.Bottom line, our sensors would not effectively communicate with the base unit,We bought a system from another company that basically had the same specs and same setup as this system. We set it all up, with the base unit in our house vs. having to be down in the garden, and it has been working perfectly all this time.**Update 8/12/14Since a couple people asked what we're using - we bought our system through http://www.harrisseeds.com/storefront/s-283-thermometers-weather-stations.aspx when the sensors were on sale for $14.95 each. That model has been discontinued, but they do have some on clearance for 29.95 as of today. Ours have the label 'Weather Direct" on them, and through their website we are able to view the sensor information, set alarms, and download all the data to a spreadsheet. As of today we still have not needed to reset a single sensor.

Works as advertised. when calibrating, all sensors were within 2% and 1 degree. Alarm function is hit and miss - alarms randomly going off during the night.

Second additional purchase. Expensive and unreliable. Buy Something else.