Megger TOS1 – Transformer Ohmmeter Standard

• High accuracy ±0.1% resistance reference standard
• Wide resistance range for calibration checks
• Four-terminal Kelvin connection design
• Compatible with single and three-phase ohmmeters
• Rugged construction for lab and field use

The Megger TOS1 Transformer Ohmmeter Standard is a precision reference instrument designed to support accurate resistance verification. Built for calibration environments, it provides stable and dependable reference values across a wide resistance range. The four-terminal Kelvin configuration ensures reliable measurement performance while eliminating the need for lead compensation. At the same time, the rugged enclosure makes the unit suitable for both laboratory calibration work and portable field verification. Large test clip connections and banana jack inputs also allow straightforward integration with a variety of ohmmeters. With its solid construction and dependable accuracy, the Megger TOS1 fits easily into professional testing and calibration workflows.