When looking for a surge suppressor, what are some important criteria to consider? Joules: a joule measure a surge suppressor's ability to absorb damaging surges and protect equipment. The more joules a surge suppressor has, the more protection it provides. Tripp Lite Surge Suppressors provide one of the highest joule surge protection ratings in their class. Insurance & Warranties: the level of insurance a unit has is a direct reflection of the confidence the manufacturer has in the quality of their products, the higher the insurance, the higher the quality. Tripp Lite stands behind the superior quality of its surge suppressors with the highest insurance coverage in each model's class. Tripp Lite will repair or replace connected equipment damaged by surges (including direct lightning strikes) for life. Coverage begins at purchase, with no forms to fill out or send in. In addition, unlike many competitors, Tripp Lite provides a lifetime product replacement warranty for all of its surge suppressors. UL-Certification: it is vitally important that a surge suppressor has undergone proven safety testing (by internationally-recognized, independent testing labs such as ETL) to Underwriter's Laboratories (UL) standards. All Tripp Lite Surge Suppressors are in full compliance and certified to UL 1449 3rd Edition standards, and exceed UL's best rating of 330 V let through. Long History of Service & Support: Tripp Lite backs up its surge suppressors with the longest history of trusted service in the industry. Tripp Lite support specialists are on hand to field calls or emails regarding any product or application question.