When it comes to professional-grade digital multimeters, two models that often get compared are the Klein Tools MM720 and the Amprobe AM-570. Both are True RMS meters designed for electricians and technicians, but they differ in features, safety ratings, and usability. Let’s break them down.
📊 Comparison Table
| Feature | Klein MM720 | Amprobe AM-570 |
|---|---|---|
| True RMS | ✅ Yes | ✅ Yes |
| Auto-Ranging | ✅ Yes | ✅ Yes |
| Voltage Range | Up to 1000V | Up to 1000V |
| Current Range | 10A + microamps | 10A + microamps |
| Temperature | ✅ Yes | ✅ Yes |
| LoZ Mode | ✅ Yes | ❌ No |
| Display | High-resolution backlit | Backlit |
| Min/Max Recording | ✅ Yes | ✅ Yes (with Peak Hold) |
| Safety Rating | CAT IV 600V / CAT III 1000V | CAT IV 600V / CAT III 1000V |
| Specialized HVAC Use | Microamps + Temperature | Microamps + Temperature |
| Build | Rugged Klein design | Rugged Amprobe housing |
🔍 Overview of the Klein MM720
The Klein MM720 is a versatile, rugged multimeter aimed at professional electricians and HVAC technicians. It’s designed to handle demanding environments with a strong safety rating and useful functions.
Key Features:
- True RMS for accurate readings on non-linear loads
- Auto-ranging with manual override option
- Measures AC/DC voltage, current (10A + microamps), resistance, capacitance, frequency, and duty cycle
- Temperature measurement with thermocouple
- LoZ (Low Impedance) mode to eliminate ghost voltages
- Min/Max recording for fluctuating signals
- High-resolution backlit display
- CAT IV 600V / CAT III 1000V safety rating
Best For: Professionals working in HVAC, industrial, and electrical troubleshooting who need precision and safety.
⚡ Overview of the Amprobe AM-570
The Amprobe AM-570 is another True RMS digital multimeter designed for both electrical and HVAC applications. It’s known for its reliability, safety, and user-friendly features.
Key Features:
- True RMS for accurate AC measurements
- Auto-ranging with manual range option
- Measures AC/DC voltage, current, resistance, capacitance, frequency, and duty cycle
- Temperature measurement with K-type thermocouple
- Microamp function for HVAC flame sensors
- Min/Max and Peak hold functions
- Backlit display for low-light use
- CAT IV 600V / CAT III 1000V safety rating
Best For: Electricians and HVAC techs who want a solid multimeter with a focus on HVAC applications and general troubleshooting.
✅ Pros and Cons of Each
Klein MM720 Pros:
- LoZ mode eliminates ghost voltages
- High-resolution display
- CAT IV safety rating for high protection
- Excellent for both HVAC and industrial work
Klein MM720 Cons:
- Slightly bulkier than some competitors
- Pricier than Klein’s lower-tier models
Amprobe AM-570 Pros:
- Peak Hold function for capturing surges
- Strong HVAC support with microamps + temperature
- Reliable brand with a reputation for accuracy
- Comfortable grip and ergonomic design
Amprobe AM-570 Cons:
- No dedicated LoZ mode
- Display not as sharp as the MM720
🏆 Verdict: Klein MM720 or Amprobe AM-570?
Both meters are excellent choices for professionals, and they share a lot of overlap.
- Choose the Klein MM720 if you want LoZ functionality, higher display resolution, and all-around versatility for industrial and electrical environments.
- Choose the Amprobe AM-570 if you value HVAC-friendly features like Peak Hold and want a trusted alternative to Klein and Fluke.
👉 In short:
- MM720 = best for electricians who need LoZ mode and advanced troubleshooting.
- AM-570 = best for HVAC and general-purpose use with solid reliability.