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Mastech M266 Digital Clamp Meter – 1000A AC Current Tester with Insulation Testing Support, Data Hold, and Rugged Professional Carrying Case

Mastech M266 Digital Clamp Meter – 1000A AC Current Tester with Insulation Testing Support, Data Hold, and Rugged Professional Carrying Case

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FeatureDetails
AC Current Range200A to 1000A
AC/DC Voltage750V AC / 1000V DC
Resistance200$\Omega$ to 20k$\Omega$
Special FunctionInsulation Tester Interface (requires M261 module)
Jaw Opening50mm (Approx.)
Power Source9V 6F22 Battery
Price
₹ 932.20 ₹ 932.20
(Tax included)

Product Description The Mastech M266 is a heavy-duty, professional-grade digital clamp meter designed for measuring high AC currents without breaking the circuit. It is an industry-standard tool for electrical contractors and maintenance engineers at Robogears Pvt Ltd, particularly when working with industrial motors, distribution panels, and HVAC systems. The M266 is unique because it features a dedicated interface for an external Insulation Tester (M261), allowing it to double as a Megger for motor winding diagnostics. Its large 50mm jaw capacity allows for easy clamping around thick industrial cables and busbars.


Key Highlights

  • High-Current Measurement: Safely measure AC current up to 1000 Amperes using the induction clamp, eliminating the need to strip wires or interrupt power.

  • Insulation Test Compatibility: When paired with the optional M261 insulation tester module, the meter can measure resistance up to 2000M$\Omega$ for high-voltage safety checks.

  • Data Hold Function: Includes a side-mounted "Hold" button to freeze the reading on the screen, which is essential when working in tight spaces where the display isn't clearly visible.

  • Safety First Design: Built to meet IEC-1010-1 standards, featuring overload protection on all ranges and a shrouded 4mm safety jack for voltage probes.

  • Rugged Portability: Comes in a high-quality zippered carrying case to protect the precision jaws and display while being transported to job sites in Pimpri or beyond.

Technical Specifications

  • Display: 3.5 Digit LCD (2000 Counts)

  • AC Current Accuracy: $\pm$(2.0% + 5 digits)

  • DC Voltage Accuracy: $\pm$(1.0% + 2 digits)

  • Continuity Test: Audible buzzer for $< 50\Omega$

  • Dimensions: 235mm x 96mm x 46mm

  • Weight: ~310g

[Image showing the M266 clamp meter around a single phase of a 3-phase industrial cable]

Prototyping & Installation Tip (Clamp Meter Accuracy) To get an accurate reading, always clamp the meter around only one wire (either Phase or Neutral). If you clamp both together, the magnetic fields will cancel each other out, and the meter will show 0.00A. If you are measuring low currents and want more precision, you can loop the wire around the jaw 10 times and then divide the displayed reading by 10.

[Diagram illustrating the correct way to clamp a single conductor vs the incorrect way]

Note: This product includes the M266 Clamp Meter, Test Leads, 9V Battery, and Carrying Case. The M261 Insulation module is sold separately. Product images are for illustration purposes only.