Lascar el usb 2 humidity temperature and dew point usb data logger lascar el usb case p the lascar el usb case is a rugged metal case that provides additional waterproof protection for the el usb 1 data logger order code 85 3529 and 85 3419 this will allow the data logger to record temperatures in particularly harsh environments p p n b the el usb 2 can also benefit from the additional waterproof protection of the el usb case however it would be limited to measuring temperature onl