FNIRSI DMC-100 Digital Clamp Meter TRMS 9999 Counts - Rechargeable

In this review of the FNIRSI DMC-100 clamp meter, the bottom line is simple: it is a versatile, rechargeable clamp meter aimed at electricians, technicians, and serious hobbyists who need a portable tool that measures both current and voltage reliably while offering data logging and an easy-to-read color display. The standout reason to buy is the combination of a 9999 count TRMS measurement engine with curve recording and onboard storage, which makes troubleshooting and tracking trends far easier than with a basic clamp meter.

Key Features

• 9999 TRMS Counts: Provides more precise AC and DC readings for cleaner sinusoids and non-sinusoidal waveforms, useful when accuracy matters.
• 600 A Max Clamp: The 25 mm jaw supports up to 600 A current measurements, making it suitable for most residential and light commercial work.
• Data Curve and Storage: Onboard data curve display and storage for 8 real-time sets and 30 historical records let users view trends and recall past measurements.
• Color TFT Display: A 2 in 240 x 320 full-color screen with dark and light UI themes and 10 brightness levels improves visibility in varied lighting conditions.
• Rechargeable Battery: Built-in 1500 mAh lithium battery with Type-C fast charging reduces downtime and avoids constant battery replacements.
• Multiple Measurement Modes: Measures AC/DC voltage and current, capacitance, resistance, continuity, diode, frequency, temperature, and supports NCV live wire detection.

Who It's For

The DMC-100 is best for domestic electricians, field technicians, and hobbyists who need a compact, rechargeable clamp meter with strong display and data-logging features. Its 600 A clamp and TRMS capability suit tasks from battery pack work to panel troubleshooting, and the storage and curve display help when diagnosing intermittent issues.

Users who require lab-grade calibration certificates, extreme industrial durability, or very high-precision temperature readings may want to look elsewhere; several customers noted mixed results with the temperature sensor accuracy, so specialized thermal measurement instruments remain preferable for critical thermal work.

Pros & Cons

Pros

• Good value for money given the breadth of functions, including TRMS and data storage.
• Bright, clear full-color display with dual themes and adjustable brightness makes readings easy to see.
• Rechargeable battery with Type-C charging is convenient for field use and long jobs.
• Power mode and curve recording help capture transient events and compare voltage/current simultaneously.

Cons

• Build durability has received mixed feedback from some users, so heavy industrial use may expose limitations.
• Temperature measurement has been reported as less accurate by a subset of customers, so rely on it for rough checks only.

Specifications

Measurement Counts	9999 TRMS counts
Max Current	600 A (clamp)
Display	2 in 240 x 320 TFT full-color
Storage	8 real-time sets, 30 historical records
Battery	Built-in 1500 mAh lithium, Type-C charging
Jaw Width	25 mm
Functions	AC/DC V, AC/DC A, capacitance, resistance, continuity, diode, frequency, temperature, NCV

Our Verdict

The FNIRSI DMC-100 is a feature-packed clamp meter that delivers strong value for electricians and hobbyists who need TRMS readings, a clear color display, and onboard data storage in a rechargeable package. While not a precision thermal instrument and with some questions about long-term ruggedness, it is a practical, versatile tool for most field and workshop troubleshooting tasks.

Frequently Asked Questions

Can the clamp measure DC current?
Yes, the DMC-100 supports both AC and DC current measurement using the clamp jaws.

Does it store measurement history?
Yes, the meter stores 8 real-time data sets and up to 30 historical records for later review.

How is voltage measured?
Voltage must be measured with the test leads; the clamp jaws are for current only.