In this post we compare two similar multimeters from Klein Tools.
This article will delve into a comparative analysis of these two models, examining their technical specifications, usability, and functionality to help you make an informed decision.
Overall, the Klein MM420 has some advantages over the MM400 by way of capacitance measurement limit, True RMS and Duty cycle measurements.
The article also explains in what situations you would need these enhancements.
Comparison Table
Here is a comparison table highlighting the key features and differences between the Klein MM400 and Klein MM420 multimeters:
| Feature | Klein MM400 | Klein MM420 |
|---|---|---|
| 💳 Cost | Check Price | Check Price |
| Basic Accuracy (DC Voltage) | ±0.5% | ±0.5% |
| Voltage Range (AC/DC) | Up to 600V | Up to 600V |
| Current Range (AC/DC) | Up to 10A | Up to 10A |
| True RMS | No | Yes ✅ |
| Resistance | Up to 40 MΩ | Up to 40 MΩ |
| Capacitance | Up to 100 µF to 200 µF | Up to 200 µF to 2000 µF ✅ |
| Temperature Measurement | Yes, with thermocouple included | Yes, with thermocouple included |
| Frequency/Duty Cycle | Frequency only | Frequency and Duty Cycle ✅ |
| Display | 4000 count LCD | 4000 count LCD |
| Safety Rating | CAT III 600V | CAT III 600V |
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Both models share several features but the Klein MM420 offers enhancements in capacitance measurement range and includes duty cycle measurements along with frequency, positioning it as a slightly more advanced tool suitable for more varied electrical tasks.
Overview of Differences
- Capacitance Measurement: The MM420 offers an expanded capacitance measurement range (up to 2000 µF) compared to the MM400 (up to 200 µF), making it more suitable for applications involving larger capacitors.
- Frequency and Duty Cycle: While both models measure frequency, the MM420 also measures duty cycle, an additional feature that can be crucial for diagnosing and troubleshooting electronic circuits.
- True RMS: The MM420 includes True RMS (Root Mean Square) measurement for more accurate readings of non-linear loads, a feature not available in the MM400.
These enhancements make the MM420 a slightly more advanced tool, ideal for users needing extra capabilities for complex diagnostics in electrical and electronic environments.
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