Two Fieldpiece clamp meters, the SC640 and the SC680, are often compared side by side. Both are packed with features, but they serve slightly different users.
If you’re trying to decide which one is right for you, this comparison breaks down their features, differences, and best use cases.
📋 Overview of the Fieldpiece SC640
The Fieldpiece SC640 is part of Fieldpiece’s Advanced Series clamp meters. It’s designed for HVAC technicians who need accuracy, durability, and a broad set of functions for everyday diagnostic work.
Key Features:
- True RMS accuracy for precise readings
- Measures AC/DC voltage and current
- Microamps for testing flame sensors
- Inrush current measurement
- Dual display with backlight
- Temperature measurement with included thermocouple
- Jaw opening: 1.25 inch
The SC640 covers the essential and advanced functions HVAC pros need in a solid, reliable tool.
📋 Overview of the Fieldpiece SC680
The Fieldpiece SC680 takes things further as part of Fieldpiece’s Top-of-the-Line Series. It offers expanded functionality, higher measurement ranges, and modern connectivity features.
Key Features:
- True RMS accuracy
- AC/DC voltage and current with higher ranges than SC640
- Power (Watt) measurement capability
- Total harmonic distortion (THD) and phase rotation testing
- Bluetooth connectivity for use with the Fieldpiece Job Link® app
- Dual display with backlight
- Microamps and temperature measurement
- Jaw opening: 1.5 inch
The SC680 is built for technicians who want advanced diagnostics, connectivity, and data logging in their clamp meter.
🔍 Side-by-Side Comparison
| Feature / Spec | Fieldpiece SC640 | Fieldpiece SC680 |
|---|---|---|
| Series | Advanced Series | Top-of-the-Line Series |
| True RMS | Yes | Yes |
| AC Current Range | Up to 600A | Up to 1000A |
| Jaw Opening | 1.25 inch | 1.5 inch |
| Voltage Measurement | AC/DC | AC/DC |
| Microamps for Flame Sensors | Yes | Yes |
| Inrush Current | Yes | Yes |
| Power (Watt) Measurement | No | Yes |
| Harmonics / THD | No | Yes |
| Phase Rotation | No | Yes |
| Bluetooth / App Support | No | Yes (Job Link® app) |
| Display | Dual display with backlight | Dual display with backlight |
| Temperature Measurement | Yes | Yes |
| Best For | HVAC techs needing essential + advanced features | Advanced pros needing power analysis, app integration, and higher ranges |
✅ Pros and Cons
Fieldpiece SC640
Pros:
- Rugged, reliable, and accurate
- Covers all essential HVAC measurements
- More affordable than SC680
- Easy to use with intuitive layout
Cons:
- No Bluetooth or app support
- Lower current range (600A max)
- Lacks power measurement and harmonics analysis
Fieldpiece SC680
Pros:
- Expanded measurement ranges (up to 1000A)
- Advanced functions: power, THD, phase rotation
- Bluetooth connectivity with Fieldpiece Job Link® app
- Larger jaw opening for bigger conductors
Cons:
- Higher price point
- Slightly bulkier than SC640
🏆 Verdict: SC640 vs SC680
- Choose the Fieldpiece SC640 if you want a durable, accurate, and feature-rich clamp meter for everyday HVAC and electrical tasks at a reasonable price.
- Choose the Fieldpiece SC680 if you need advanced diagnostics, higher current measurement, and Bluetooth connectivity to streamline your workflow.
Both meters are excellent, but the SC680 is the better choice for advanced professionals, while the SC640 is a great balance of performance and cost for most HVAC techs.