Bluetooth Compatible Thermometer, Hygrometer & Dew Point Sensor Logger, 270 Feet Range, 250 Day Device & Unlimited Phone Storage. Simple Data Export.

Update to my earlier review:I've now had the sensor for over a year and recently had to replace the battery. The screws are so small that my smallest Phillips screwdriver didn't quite fit. In the process of trying I stripped the heads and ended up damaging the disc's back cover.I contacted Blue Maestro's customer support and Kirstin sent me new screws and a new back, all free of charge!I now have the correct size screwdriver (Phillips #00) and managed to change the battery no problem with the supplied new back and screws. Great service!Original review:I wanted a temperature gauge which could log the temperature to my smartphone for when I'm camping or hiking. I got my Tempo Disc a couple of months ago now and it's a great little gadget. It's really quite small and weighs next to nothing. I've calibrated it against a couple of other thermometers and it seems to be quite accurate.To get a correct reading the temperature sensor can't be kept on the person. This means the sensor has to be robust and weather resistant enough to be hung from a backpack, as shown, or live in one of the side pockets. The Tempo disc appears to meet all the requirements. Especially with the little gel case shown in the photos, which is sold separately on the company BlueMaestro's own site. (It's a shame they don't sell it as a bundle option on Amazon.) On the company's site they also have a key hanger version of the sensor but that includes a pressure sensor and since my phone already has one of those I did not need that. The staff at BlueMaestro were very helpful and friendly when I ordered the little gel case.I've now had the sensor with me on quite a number of outings and it works really well. The readings appear on the app on the phone with no problem and the app also gives you a high and low for the last 24 hours which is nice. You have to make sure it is out of direct sunlight so I mostly have it one of the mesh side pockets of the pack. This ensures plenty of air flow and accurate readings. So far it has withstood a couple of very wet days without any issues. It isn't sold as waterproof but it seems to be able to withstand very humid conditions, 85.1% according to its own reading, without any problem.The temperature logs can be downloaded from the sensor into a spreadsheet and so I now have accurate temperature charts to go with the other data from our hikes and treks. Combined with photos, maps, and notes they make for a very useful record of what things were like.Lastly, the way it is all packaged deserves a mention. The sensor itself is very well protected in a metal case. There's a full paper manual and download instructions for the app. I also love the fact that they give away Haribo sweets with it.

I've had my 2 Temp Discs 2 months, and 1 month - and they're both recording without problems.They're tiny little things (the size of a 50p piece), and very light as well - they didn't come with any fixing frame but being so light I was able to use some wood glue I had to hold them in place on the two walls where they currently stay.Each Tempo Disc comes in a small metal container, and is activated by clicking the blue top cover.They're NOT waterproof but they can be used outside, as long as they are protected from any rain, or icing frost.Once activated I was able to use the Android application (screenshots below) to set the Tempo's recording interval, name, transmission power level, and current date.Be warned! Set the date BEFORE you want to start taking readings, if you don't then the Tempo will make readings with a "Reading number" and not a date.After a couple of days I set the date and was a little surprised to see the data my phone had already stored had been cleared away.It's a little "gotchya", but one easily avoided when you now about it.This device has MANY configurable settings - much more than the other leading temperature sensors on Amazon.To see them all, please look at Photo F.They have a little LED indicator that can be triggered by the phone app to ensure the sensor you're setting in the application is the one you're looking at.If the signal power is low when you're trying to sync the data with your phone, the app is helpful, and will tell you that - so you can move a bit closer to the sensor.The temperature and humidity sensor are accurate - both Tempo Discs I have read very similar when next to each other, as well as to a different model I already had in place.I regularly download the data from my phone to my PC to enable me to log it with an Excel spreadsheet I use."Tempo Disc Myths"I'm including this bit after reading some VERY misleading information made by other reviewers, which were not accurate.>>"The x-axis shows date and time on the iOS app, but only data points on the Android app . As an Android user this is something that needs to be corrected ASAP."This feature is now in the Android version - please see Photo D, on the right hand column.>>" it doesn't seem to come with any instructions so it took a little time to get used to how it works"While true, there ARE instructions online. I don't think we can post website addresses, but it's on the item page.>>" Even when there is a change of the reading, it does not update the app"If this was an application issue, and not one of the phones - it has been corrected in the Android software.When you open the app - all the Tempo Discs in range are available to view their current readings - you do NOT need to sync the stored data to se e the current temperature and humidity values.I've bought a second Temp Disc because I've found the first so useful in having configurable sensor readings and logging readings. The device is also very competitively priced compared to other systems on the market.They're still going strong after 2 months, and so far I've had no problems.

I have only been using the sensor for a phew days but so far i am very impressed. Setup was very easy through their app, which seems well built and intuitive to use and gives you easy access to settings on the device. Downloading data and viewing it is also very easy through the app and is presented in a fairly clean and readable manner.I also contacted the seller to ask a phew question's and received a very prompter's response (within an hour), and found them friendly and helpful.I wan't to test this for a longer duration but if i keeps preforming as it currently is i will be picking up a couple more of these.Edit: While the sensor itself seems very good i feel it is let down a little by the app, the app work and show you the live data and downloaded data fine but what slightly annoys me is that every time you download data from the sensor it creates a new log and you can't merge logs together to see data over a longer period. It would be great if you could download data into an existing log so that on one page you can see data over a much longer period and only have one log per sensor. The reason i think this is important is that if you record at a high log rate of once a minute the device can only store about 4.5 days of data so the max data i can see on one log is the previous 4.5 days, you also can't rename the logs so its trial and error to work out which log shows the data you see.