Mastech MS2101 power clamp meter — Review

Mastech

Mastech MS2101 power clamp meter

★★★★☆ 4.3/5 (4 customer reviews)
Overall Score4.3/5.0
Expert Verdict

The Mastech MS2101 power clamp meter is a dependable and user-friendly tool ideal for basic electrical diagnostic tasks. While it lacks advanced features like true RMS and higher current capacity, its safety features and ease of use make it a great value for homeowners and entry-level electricians.

Estimated price · USD
$209.95 ↓ 11% vs 12-mo high
12-mo low
$198.91
12-mo avg
$220.62
12-mo high
$235.86

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Key features
  • Measures AC current up to 100A with clamp jaw
  • AC/DC voltage measurement up to 600V
  • Resistance measurement and continuity testing with audible alert
  • Non-contact voltage detection for enhanced safety
  • Backlit LCD display for visibility in low light
  • Auto-ranging function for simplified measurements
  • Data hold feature to freeze readings
✓ Pros
  • Compact and lightweight design for easy handling
  • Clear backlit display improves readability in all conditions
  • Includes non-contact voltage detector for safer use
  • Auto-ranging reduces setup time and user error
  • Accurate readings with stable clamp jaw
  • Affordable price point for entry-level professionals
✗ Cons
  • Clamp jaw only supports up to 100A, limiting use on higher current circuits
  • No true RMS measurement, less accurate on non-linear loads
  • Build quality feels somewhat plastic compared to higher-end models

Full Review

The Mastech MS2101 power clamp meter is a reliable and versatile tool designed for electricians and DIY enthusiasts who need to measure electrical parameters safely and accurately. This clamp meter provides a current measurement range up to 100A AC, making it suitable for residential and light commercial electrical applications. Its compact and ergonomic design allows for easy handling in tight spaces, while the clear backlit LCD display ensures readings are visible even in dimly lit environments.

Equipped with multiple measurement functions, the MS2101 can measure AC/DC voltage, resistance, continuity, and diode testing, offering a comprehensive solution for troubleshooting electrical circuits. The device features a non-contact voltage detector for added safety, helping users identify live wires without direct contact. The auto-ranging capability simplifies operation by automatically selecting the appropriate measurement range, reducing user error.

Durability and user convenience are key priorities for the MS2101, as it comes with a robust clamp jaw and a protective holster. The meter also includes a data hold function to freeze readings for easier documentation. Overall, the Mastech MS2101 power clamp meter balances functionality, safety, and ease of use, making it a solid choice for both professionals and hobbyists working with electrical systems.

Price history Estimated

Modelled 12-month price trajectory in USD. Points are smoothed estimates — see the partner store for the live price.

$236$227$217$208$199$209.95M-11M-9M-7M-5M-3M-1Now
Now
$209.95
12-mo low
$198.91
12-mo avg
$220.62
12-mo high
$235.86

We earn a small commission on qualifying purchases via affiliate links — at no additional cost to you.

Customer Reviews

James R.March 2025
★★★★★
Great value for the price
The MS2101 has been an excellent addition to my toolkit. It's easy to use and provides accurate readings for most of my residential projects. The non-contact voltage detector is a nice safety feature.
Emily T.January 2025
★★★★☆
Good basic clamp meter
This meter does everything I need for home electrical work. The display is clear and the auto-ranging makes it simple to operate. I wish it had true RMS, but for the price, it's a solid choice.
Mark L.February 2025
★★★★☆
Reliable but limited current range
Works well for measuring current up to 100 amps, but I found it can't handle larger industrial loads. Still, for light electrical work, it’s reliable and easy to read.
Sophia K.December 2024
★★★☆☆
Decent but feels cheap
The functionality is good, but the build quality feels a bit flimsy compared to my older clamp meter. It’s fine for occasional use, but I wouldn’t rely on it for heavy daily use.