I am using Level Troll 400 .
For the current setup(using Mayfly datalogger) with cable length 1 m to sensor, I only test it in office for four days.
Previous setup(replaced by Mayfly now) using Pro Micro, SD breakout, RTC breakout and 3G breakout. I tested it in office for 21 days.
Both test result were good. But still need to fix some minor problems
I will put it to site for testing in coming few days