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See attached diagram for sensor location in HOBO U20 stainless steel data loggers.
Attached is a screenshot of a data file recorded by a HOBO U20-001-XX with multiple intervals configured. Up to eight (8) intervals can be programmed into the U20 at time of launch.
The HOBO MX2001 logger top-end unit (MX2001-TOP) is IP67-rated weatherproof, but should not be considered waterproof.
This paper highlights results from Onset's tests of the HOBO Water Level logger and comparable loggers from two competitors.