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The EL-USB-CASE is a rugged metal case that provides additional waterproof protection for the EL-USB-1 data logger. This allows the data logger to record temperatures in particularly harsh environments.
The EL-USB-2 & EL-USB-2+ can also benefit from the additional waterproof protection of the EL-USB-CASE, however would be limited to measuring temperature only.
If you're having troubles with this device, contact support at 530-899-8434, or send an e-mail to firstname.lastname@example.org.