Valhalla Scientific is a technology leading manufacturer of precision electronic measurement and calibration instrumentation. In 1971, they introduced the world's first 3 1/2 digit multimeter with a built-in frequency counter. Valhalla engineers, working with customer requirements, pioneered the use of automatic temperature compensation (ATC) capability on several Valhalla micro-ohmmeters. This feature minimizes the dramatic effect (measurement error) ambient temperature has when measuring resistance of conductive materials such as copper or aluminum wire.