Product OverviewThe Mastech M266 is a classic, versatile digital clamp meter designed for both industrial electrical maintenance and hobbyist projects. It is widely recognized for its robust construction and reliability in measuring high AC current, AC/DC voltage, and resistance. With its large 50mm (2.0 inch) jaw opening, it is particularly effective for working with thicker electrical cables found in commercial and industrial settings. Key FeaturesMultifunctional Measurement: Capable of measuring AC current, AC and DC voltage, resistance, and continuity. High-Capacity Current Sensing: Features a large jaw design (50mm/2.0") that can accommodate cables with a diameter of up to 50mm, allowing for up to 1000A AC measurement. Insulation Test Compatibility: Supports optional insulation tester units (e.g., 500V insulation tester), allowing the meter to expand its diagnostic capabilities for insulation resistance measurements (20MΩ to 2000MΩ). User-Friendly Utilities: Includes a "Data Hold" function to freeze readings for easy recording, a continuity buzzer (typically <100Ω), and low-battery indication. Safety & Durability: Certified for CAT II 1000V and CAT III 600V environments, ensuring protection during standard industrial electrical tasks. Technical SpecificationsFeatureSpecificationBrandMastechModelM266AC Current200A / 1000AAC Voltage750VDC Voltage1000VResistance200Ω / 20kΩInsulation Test20MΩ to 2000MΩ (with optional accessory)Max Display2000 counts (3½ digit LCD)Jaw Opening50 mm (2.0")Safety RatingCAT III 600V / CAT II 1000VPower Source9V (6F22) BatterySEO KeywordsMastech M266, Digital Clamp Meter, AC Current Tester, 1000A Clamp Meter, Industrial Clamp Meter, Mastech M266 Specs, Electrical Troubleshooting Tool, Insulation Test Clamp Meter.
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