Extech 380260 Insulation Tester 250V, 500V, 1000V 2000 MΩ

The Extech 380260 insulation tester delivers three selectable test voltages—250V, 500V, and 1000V—with insulation resistance measurement up to 2000 MΩ, making it suitable for verifying wiring integrity and motor insulation in industrial and field environments. Unlike basic megohmmeters, it also measures AC/DC voltage and low resistance, providing a versatile tool for preventive maintenance.

Highlights

• Insulation test voltages: 250V, 500V, 1000V
• Insulation resistance range: up to 2000 MΩ
• AC/DC voltage measurement up to 750V AC and 1000V DC
• Resistance measurement from 0.1Ω to 2000Ω
• 2000-count LCD with backlight for low-light use
• Data hold, auto power off, and lock power functions
• Continuity beeper threshold <40Ω
• Overload protection and CAT III 1000V / CAT IV 600V safety rating
• Powered by 8 AA batteries (included)
• Includes test leads, alligator clips, and hard carrying case

In daily use

Select the appropriate test voltage for the insulation under test, connect the leads, and press the test button. The large backlit display shows the resistance value clearly, and the data hold function freezes readings for later review. The auto power off helps conserve battery life during long work sessions.

Full specifications

• Insulation test voltages: 250V, 500V, 1000V
• Max insulation resistance: 2000 MΩ
• Insulation resistance accuracy: ±(3% rdg + 5 digits)
• AC voltage range: 0 to 750V AC
• DC voltage range: 0 to 1000V DC
• Resistance range: 0.1Ω to 2000Ω
• Display: 2000-count LCD with backlight
• Safety rating: CAT III 1000V, CAT IV 600V
• Power source: 8 x AA batteries
• Continuity beeper threshold: <40Ω
• Operating temperature: 0 to 40°C (32 to 104°F)
• Storage temperature: -10 to 60°C (14 to 140°F)
• Relative humidity: <80% RH
• Included accessories: test leads, alligator clips, hard carrying case, 8x AA batteries

Final note

The Extech 380260 combines insulation testing with voltage and resistance measurement in a rugged, portable design, suitable for electrical contractors and maintenance technicians.