Megger has been the premier provider of electric test equipment and measuring instruments for electrical power applications for over 100 years. Now Named Megger, the company was previously called Avo International, Avo Biddle, and Biddle Megger before renaming it simply Megger today. The trademark was first registered in May 1903 and is jealously guarded by the company. Although we're best known for our world famous range of insulation testers, Megger provides a full service solution to meet your electrical test and measurement needs. Our products provide testing solutions in the most critical maintenance areas including cable fault locating, protective relay testing, on-line monitoring of substation apparatus, and power quality testing. With such a diverse product offering, we are the single source for electrical test and measuring instruments. See Complete Megger Catalog in PDF format.