Fluke 107 vs Klein MM420: Which Multimeter Should You Choose?

Both Fluke and Klein Tools are trusted names in the test and measurement industry, producing reliable multimeters for electricians, technicians, and hobbyists.

🏷️ Fluke Multimeter Deals ⭐⭐⭐⭐

The Fluke 107 and Klein MM420 are both compact digital multimeters designed for everyday troubleshooting. While they have similarities, each one targets slightly different users and applications.

Table of Contents

📋 Overview of the Fluke 107

The Fluke 107 is a pocket-sized, professional-grade digital multimeter that emphasizes portability and simplicity without sacrificing accuracy.

Fluke 107 – Check Price on Amazon

Key Features:

True-RMS for accurate measurements on non-linear loads
Voltage: up to 600V AC/DC
Current: up to 10A (for short periods)
Resistance, continuity, diode test, and capacitance
Frequency measurement up to 100 kHz
Compact design with one-handed operation
Backlit display for low-light environments
CAT III 600V safety rating

The Fluke 107 is best for electricians and technicians who need a compact, durable, and accurate multimeter for daily use.

📋 Overview of the Klein MM420

The Klein MM420 is a True-RMS auto-ranging digital multimeter that provides a broader measurement range and advanced functions compared to the Fluke 107.

Klein MM420 – Check Price on Amazon

Key Features:

True-RMS accuracy
Voltage: up to 1000V AC/DC
Current: up to 10A
Resistance, continuity, capacitance, diode test
Frequency measurement up to 500 kHz
Temperature measurement (with included probe)
Low impedance (LoZ) mode to eliminate ghost voltages
CAT III 1000V / CAT IV 600V safety rating

The Klein MM420 is aimed at professionals who need higher voltage capacity, LoZ functionality, and temperature measurement in addition to standard troubleshooting.

⚖️ Side-by-Side Comparison

Feature	Fluke 107	Klein MM420
True-RMS	✅ Yes	✅ Yes
Voltage Range	Up to 600V AC/DC	Up to 1000V AC/DC
Current Range	Up to 10A	Up to 10A
Frequency Range	Up to 100 kHz	Up to 500 kHz
Capacitance	✅ Yes	✅ Yes
Temperature Measurement	❌ No	✅ Yes
LoZ (Low Impedance Mode)	❌ No	✅ Yes
Display	Backlit, 6000 counts	Backlit, 6000 counts
Safety Rating	CAT III 600V	CAT III 1000V / CAT IV 600V
Portability	Very compact	Slightly larger
💳 Pricing	💲 Check Price	💲 Check Price

👍 Pros and Cons

Fluke 107
✅ Compact, pocket-sized design
✅ Reliable and rugged build quality
✅ Easy one-handed operation
✅ Affordable compared to the Klein

❌ Costs more
❌ Limited to 600V
❌ No LoZ or temperature measurement
❌ Smaller feature set

Klein MM420
✅ Higher voltage rating (up to 1000V)
✅ Includes LoZ mode for ghost voltage elimination
✅ Temperature measurement capability
✅ Wider frequency range
✅ Higher safety rating (CAT IV 600V)

❌ Slightly bulkier than the Fluke 107

🛠️ Which One Should You Choose?

Choose the Fluke 107 if you need a simple, compact, and reliable multimeter for everyday troubleshooting, especially in residential and light commercial work. It’s portable and budget-friendly without compromising accuracy.
Choose the Klein MM420 if you want advanced features like temperature measurement, LoZ mode, and higher voltage capacity. It’s better suited for professionals who need more versatility and work with higher-voltage systems.

💡 Final Thoughts

Both the Fluke 107 and Klein MM420 are solid digital multimeters, but they serve different needs. The Fluke 107 is ideal for portability and simplicity, while the Klein MM420 offers more advanced functionality and higher safety ratings. Your choice depends on whether you value compact convenience or advanced measurement features.