The IDEAL Electrical 61-763 True-RMS AC Clamp Meter with Tightsight Display, 660A AC is feature-rich, built to professional quality standards to withstand tough use in commercial and industrial settings. The High Frequency Rejection (HFR) feature measures accurately even in noisy electrical environments. For everything from load measurement to troubleshooting industrial motors and adjustable speed drives (ASDs), the new TightSight Clamps bring speed, accuracy, safety and ease-of-use together in one rugged meter line.