Both Fluke and Klein Tools are trusted names in the test and measurement industry, producing reliable multimeters for electricians, technicians, and hobbyists.
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.
📋 Overview of the Fluke 107
The Fluke 107 is a pocket-sized, professional-grade digital multimeter that emphasizes portability and simplicity without sacrificing accuracy.
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.
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 |
| Price Range (approx.) | $ (budget-friendly) | $$ (mid-range) |
👍 Pros and Cons
Fluke 107
✅ Compact, pocket-sized design
✅ Reliable and rugged build quality
✅ Easy one-handed operation
✅ Affordable compared to the Klein
❌ 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
❌ Costs more
🛠️ 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.