Digital Clamp Multimeter M266F - 1000A AC Tong Tester with Frequency & Data Hold

Specifications

• AC Current: 200A / 1000A (±2.0%)

• AC Voltage: 750V (±1.2%)

• DC Voltage: 1000V (±1.0%)

• Resistance: 200Ω / 20kΩ (±1.0%)

• Frequency Measurement: 2kHz (±1.5%)

• Insulation Test: 20MΩ / 2000MΩ (with optional 500V tester)

• Display: 3.5 Digit LCD (1999 count)

• Jaw Opening: 50mm (Max)

• Features: Data Hold, Continuity Buzzer, Diode Test

• Power: 9V Battery (6F22)

Key Applications & Projects

• Industrial Motor Testing: Monitor startup inrush current and running loads on heavy machinery.

• Solar Power Systems: Measure AC output from inverters and check frequency stability.

• HVAC Maintenance: Diagnose compressor motor health by checking current draw against nameplate ratings.

• Home Electrical Audits: Detect phantom loads or unbalanced phases in residential mains.

Project Evolution

• Past Projects (Prerequisites): If you’ve mastered basic low-voltage circuit testing with a standard DT830D, the M266F is your bridge into high-power AC systems.

• Feature Upgrade: This tool unlocks "Non-Invasive Sensing." You no longer need to shut down equipment to take a reading, allowing for real-time live-load analysis.

• Effort/Requirements: Beginner Friendly. Operation is straightforward, but users must understand basic electrical safety and the "one wire at a time" rule for clamp meters.

Virtual Technician & Wiring

• Single Wire Rule: To measure current, clamp the meter around only ONE wire (Phase or Neutral). Clamping a dual-core cable will result in a zero reading due to magnetic field cancellation.

• Safety First: Always use the included wrist strap when working at heights or inside deep panels to prevent dropping the meter.

Accessories

• Included: 1x M266F Digital Clamp Multimeter.

• Included: 1x Pair of High-Quality Testing Probes.

• Included: 1x Heavy Duty Carrying Case.

Frequently Asked Questions (FAQ)

• Can this measure DC Current? No, the M266F is an AC-only current clamp. It can measure DC Voltage, but not DC Amps.
• What is the maximum wire diameter it can clamp? The jaw opening is 50mm, sufficient for almost any standard industrial cable.
• Does it measure Frequency? Yes, the 'F' in M266F stands for Frequency measurement up to 2kHz.
• Is it safe for 440V 3-phase systems? Yes, it is rated for up to 750V AC.
• Why do I get a zero reading when clamping a power cord? You are likely clamping both Phase and Neutral together. You must clamp only one conductor.
• Can it measure insulation resistance? Yes, but it requires an external 500V insulation tester module (sold separately).
• Does it have an auto-off feature? The M266F is a manual-switch device to ensure the battery doesn't cut out during long-term monitoring.
• Is the battery included? Yes, we provide a Probots™ QC-Pass ✅ 9V battery with every unit.
• What is 'Data Hold'? Pressing the hold button freezes the current reading on the screen, useful in dark or cramped panels.
• How accurate is the current reading? It is accurate within ±2.0% + 5 digits.
• Can it test diodes? Yes, it has a dedicated diode test function with a buzzer.
• Is it drop-resistant? It is built with rugged industrial plastic, but like all precision instruments, it should be handled with care.
• What is the frequency range? It measures AC frequency up to 2000Hz (2kHz).
• Can I use third-party probes? Yes, it uses standard shrouded 4mm banana jacks.
• Does it measure True RMS? The M266F is an average-sensing meter calibrated for sine waves.
• How do I test continuity? Switch to the buzzer icon; it sounds instantly for resistances below ~50Ω.
• Is there a backlight? This specific model focuses on high-contrast LCD visibility rather than a backlight to save battery.
• Can I use it for low-current (mA) electronics? It is designed for higher currents; for mA, we recommend using a standard multimeter in series.
• What is the CAT rating? It is rated for CAT II 1000V / CAT III 600V.
• Where can I get technical support? Our Probots™ Tech-Bridge ???? team in Bangalore is available for all hardware queries.