Surge protector devices are designed to provide supplementary protection for a datalogger or supporting accessories from spikes in voltages. Large spikes in voltage can damage equipment and affect measurement performance. Surge protector devices block or shunt unwanted voltages to ground. Note that all Campbell Scientific equipment has internal protection, and these devices offer supplemental, external protection. The two styles of external surge protection are suited for sensors or power. Please contact one of our Support and Implementation Engineers to discuss your needs.