Extech EA15 Easy View Temperature Datalogging Dual Input Thermometer

Bought this thermometer to test temperature accuracy in different zones in fridge. This thermometer worked nicely during testing of my recently purchased portable refrigerator. I used the min/max function to find how much temperature varied inside the fridge. Very helpful. I did notice about 2 degree F variant in temperature between channels (which could be attributed to error in thermocouple as well as instrument error) while thermocouples were in glass of crushed ice water.

Makes the job.

It works

I picked up this data logger to monitor the transmission temperatures on my 2003 Honda Odyssey to see how high they tend to get (the Odyssey is well known for overheating transmissions). I attached some K-type bead thermocouples to the metal portion of the fluid lines that go between the transmission and the cooler using aluminum foil tape (which can withstand the heat) and thermal mastic to ensure good heat transfer between the lines and the TC. I'm extremely happy with this setup so far. As for the data logs, I import them into Matlab for plotting, but Excel works just fine too.The good:1) Powers up and starts displaying temperatures pretty quickly. If you're just using it as a 4-channel thermometer, you're done.2) Data logging starts/stops with the press of a button. Couldn't be easier. I'd recommend having USB->SD card adapter handy after the fact to more easily transfer the data onto your computer.3) I checked each of the TC's (not the ones included with the unit) in a glass of ice water to ensure they read 32 deg F and all were less than 1 deg F off from freezing, with about a 0.1-0.2 deg F variation between TC's. Try getting that kind of agreement between sensors on a standard PTC or NTC style temperature sensor (without a bunch of calibration resistors)!4) Saves to a .XLS format, which can easily be opened on most computersThe bad:1) I doubt this is uncommon for these types of devices, but setting up the unit, while not difficult if you have the manual in front of you, has many setting that are so highly abbreviated on the display that it's not intuitive what that setting is. Even after doing it once, I still have to refer to the manual if I want to change any settings.2) The way it logs data to a file is awkward. I would prefer to have the unit generate a new file every time I start a new log. Instead, it continues logging to the same file, and simply adds another set of column labels in between the previous and current logs. Not a huge deal, but makes it a bit more annoying to plot up the data. Supposedly the unit can only log up to 30,000 points to a file. I haven't yet figured out what it does when it reaches 30,000 points, but I'm guessing it generates a new file and starts a new log.All said, I'm very happy with this unit and would definitely recommend it. Since TC's are fairly inexpensive, I'm planning to instrument my other vehicles' transmissions with them and see how the readings compare. I also do a fair bit of automotive A/C work as well, and will be using it to monitor vent and ambient temperatures there to quantify how well the A/C is working after a repair.

Muy buen equipo lo único es que no viene con certificado de calibración de las termocuplas

Nice little dual thermometer. Extech is a good value brand. I was disappointed to find out that you need a computer connected to the meter in order to log temperatures. "Logging" to me means a device that can log independently.

This thermometer is just awesome, comes with two excellent thermocouples with a fine tip, perfect for measuring all things. I bought two thermometers for a science project, and the accurate is awesome!!! "0.0ºC of variation between termocuples and between thermometers"... is like a dream, accurate maximal. 100% recomended!!!

This thermometer gave me good results for what I needed. The logging works well, the CSV file produced allows any spreadsheet program to open the log.