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Mastech M266F Digital Clamp Multimeter – Professional 1000A AC Current Meter with Frequency (2kHz) and Insulation Testing Support for Industrial Maintenance

Feature	Details
AC Current Range	200A to 1000A
AC/DC Voltage	750V AC / 1000V DC
Frequency Range	Up to 2kHz
Resistance	Up to 2M$\Omega$
Isolation Test	20M$\Omega$ to 2000M$\Omega$ (with external module)
Jaw Opening	50mm (2.0")

Price

🚚 Ships within 24 Hours
📦 Pan India Delivery

₹ 1,271.19

(Tax included)

Barcode: 72101

Product Description

The Mastech M266F is an upgraded version of the classic M266, adding Frequency measurement (up to 2kHz) to its already robust industrial feature set. Designed for electrical auditors and industrial technicians at Robogears Pvt Ltd, this clamp meter is a specialised tool for measuring high-current AC loads in motors, transformers, and distribution panels. Like its predecessor, the M266F includes a dedicated interface for an external Insulation Tester unit, allowing you to perform high-voltage resistance checks (Megger functions) to ensure system safety and compliance.

Key Highlights

Frequency Measurement: Unlike standard clamp meters, the M266F can measure frequency up to 2kHz, making it ideal for checking the output of variable frequency drives (VFDs) and power generators.
Large 50mm Jaw: The oversized jaw opening accommodates thick industrial cables and high-voltage busbars, allowing for non-invasive current measurement up to 1000 Amperes.
Comprehensive Safety Specs: Rated for CAT II 1000V and CAT III 600V, providing heavy-duty protection for industrial electrical environments.
Dual Resistance & Insulation Modes: Measures standard resistance up to 2M$\Omega$ and supports up to 2000M$\Omega$ insulation testing when the optional external unit is connected.
Data Hold & Continuity: Features a side-mounted hold button to lock readings in tight spots and a loud continuity buzzer ($< 100\Omega$) for quick wiring checks.

Technical Specifications

DC Voltage Accuracy: $\pm$(0.5% + 3)
AC Voltage Accuracy: $\pm$(1.2% + 5)
Frequency Accuracy: $\pm$(2.0% + 5)
Power Supply: 9V 6F22 Battery
Dimensions: 235mm x 96mm x 46mm
Weight: ~268g

[Image showing the 3-terminal input for Voltage, Resistance, and the External Insulation Unit]

Prototyping & Installation Tip (Frequency Measurement) To measure the frequency of a power line, simply set the dial to the 2kHz position and use the test leads in the V and COM terminals. This is particularly useful for verifying that a backup generator is correctly tuned to 50Hz. When using the clamp for current, ensure the trigger is fully released and the jaws are closed tightly around the wire; any gap in the jaws will result in an incorrectly low current reading due to flux leakage.

Note: This product includes the M266F Clamp Meter, Test Leads, Carrying Case, and 9V Battery. The Insulation Tester module (M261) is sold separately. Product images are for illustration purposes only.