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When you relaunch a HOBO data logger, the device reverts to the beginning of its memory and starts writing new data over the old.
The attached image shows both the incorrect and correct assembly of a logger coupler to the BASE-U-4 (Optic Base station) and the U-DTW-1 (Waterproof Shuttle).
Attached please find an image that shows the location of optic LEDs in Pendant (UA-series) loggers. All Pendant optics are located in the same location on all models.