Extech RHT10 Humidity And Temperature USB Datalogger

• 32,000 readings
• Selectable data sampling rates
• Dew point indication via Windows software
• User programmable alarm threshold for Rh and temperature
• 3.6V lithium batter

I like the feature set and it's well made, but it doesn't work with Windows 7 64-bit.

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I bought this Data logger to log temps for Freezers, Ambient Car Temp (in the summer) and various other applications. Its very easy to use, Windows Interface works without complication for downloading and graphing Temp, Dew Point, Humidity. Software only works in Windows, but will work under VMWare Fusion (or Bootcamp / Parallels).

This unit was bought used and but was in brand new condition (it appeared it had never been used) very happy with this transaction and product.

Only drawback I saw was when you download the data, it quits logging new data. You have to reset the logger (and clear its previous logs) before starting a new log. You can't "spot check" the temp and then return it to keep collecting data... other than that, its an awesome product.

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This unit is good for remote monitoring as it has a built in battery that allows is to function without a PC. It does not function well as a PC connected unit as it does not use or charge from the USB port. Reading temperature requires downloading data, which stops measuring. The graphs, save to .xls or .txt are attractive features. The application is a minimal load for the PC as opposed to the EL-USB-RT which can put a disruptively large CPU load. There must be better options for monitoring temperature through a USB port for same room temperatures.

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As another reviewer commented, this doesn't work with Windows 7. I bought two of them originally, and of the two only one could be programmed. The bad one was replaced. I placed both in my test environment in November, with an hourly sample rate for a total of 2000 samples. This took us through February 2. One of the two downloaded its data, but the other refuses to communicate with my Windows 7 computer. Two months of sampling for nothing. Time to find another brand to try.

On the Extech website there is a software upgrade from late 2011, but this is only the PC software, not the software in the datalogger itself. I downloaded and installed the upgrade, but the logger still will not download its data to the PC.

There is a similar product available from Dataq (EL-USB-1), which I am going to try.

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Well built unit. Would love it if it worked. Win 7 64x system the drivers and software worked. BUT I can't get more than 768 readings any data after that is in error. Data download fails comnpletly if set for 2000 or more data points. Tech service a little slow but they walked me thru several possible problems, concluded my unit was defective and shipped another. 2nd unit arrived and performed exactly the same. More email tech support and attempts. Tried a second PC with Win 7 64x, than a Win 7 32x PC same performace. Tech support concluded second unit defective and sent a third. Same results. Used supplied CD software and also downloaded (same version) from thier website.

I found the apparent web site for the company supplying the drivers. Downloaded thier software development kit it had different driver version but same result.

I now have 3 units that work well if set up for 500 datapoints (or less). I wanted 2 to 10 sec data collection for my current project, but will settle for 10 minute data collection to get this job done. Will need to do a little bit of 2 sec collection to make sure I am not missing some short term variation. Lots and lots of extra work the only good side is I ended up with 3 units (no return requested for the "defective" units). When I get time I will build up a Windows XP on my computer to see if they will work with older Win systems.

The latest Extech software is version 5.6 as I write this its from early 2011. Win 7 64x driver is version 3.3. If you see later versions available than maybe they have fixed the issues.

Did I get three bad units or does software bug exist that prevents unit from working fully on Win 7 system? Either is bad if your system is Win 7. I think its a Win 7 issue and will continue to correspond with tech support, but regardless of future outcome the unit has earned a two star or less for me.