New toy arrived. Uni-T UT330TH.
I use temperature and RH loggers at work but this one is mine.
Seen here next to an older Measurement Computing USB-502. I take them home at the weekends to download data and set it to log again. (work from home 4 days a week) This looks like a rebranded Lascar EL-USB-2, which is still sold. The Lascar is about £50 from RS. Resolution of 0.5C, 1C accuracy and holds 16,000 measurements. A 1/2AA lithium primary cell runs it for about a year.
Both require propriatary software to work. You use their app to set up the logger and then download the data. The UT330TH has limited control from the device. You can start and stop logging with buttons, which the USB-502 can not do.
Both blink a green LED when taking a reading. Both also have high and low limit alarms and will flash if the alarm is triggered. However the LEDs on the 502 are normally covered over by the cap that seals off the USB connector. The cap is translucent but it makes it hard to see the LEDs. That is annoying.
The Uni-T has a 0.3C resolution, 1C accuracy and a 64,000 reading memory. The extra memory is usefull, as I normally collect measurments for two weeks or more before downloading the data. Power is from a CR2032 and is supposed to last 6 months. I will be surprised if it really lasts that long.
I'm running them now to see if the Uni-T is within the specified 1 degree accuracy. At $35.81 with VAT and shipping, it will be a bargain if it meets specs.