Amprobe TR100-A TR200-A Temperature-Humidity-Data-Loggers - Manual (Page 8)

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follow these steps to remove and replace battery:
Unscrew the rear cover of data logger. 1.
Do not remove o-ring and make sure the o-ring is in its place (groove). 2.
Remove the expired battery. 3.
insert a new battery Cr2 battery with correct polarity. 4.
Re-screw the rear cover . 5.
CR2