Finds internal transformer defects before energizing. One tester for all transformer types Tests the primary and secondary sides of de-energized transformers without disconnecting. Tests all connections from the transformer to the meter. Improve SAIDI statistics by quickly testing and getting the transformer back in service; prevents line workers from installing a fuse on a shorted transformer. Quickly verifies the secondary connections are not shorted. Compact, lightweight, and easy to use. It is powered by two 9V field-replaceable lithium or alkaline batteries. Audible alarm confirms successful test Built-in self-test A magnet is included to hold the ClearTest in place while testing.