For technicians working with process control and instrumentation, a reliable multifunction tool is essential. Fluke’s 789 and 787B ProcessMeters are two of the most trusted options in the field. Both combine the features of a digital multimeter with loop calibration capabilities, but they differ in power, features, and convenience.
📋 Overview of the Fluke 787B
The Fluke 787B is part of Fluke’s updated line of ProcessMeters designed to provide electricians and instrumentation professionals with a rugged tool that saves time.
Key Features:
- Combines a full-featured DMM with a loop calibrator.
- Measures voltage, current, resistance, frequency, and continuity.
- Sources, simulates, and measures mA for testing control loops.
- Scaled-down, lightweight design.
- Enhanced safety ratings for industrial environments.
Best For: Technicians who need a portable, durable meter for both standard electrical tasks and process loop troubleshooting.
⚡ Overview of the Fluke 789
The Fluke 789 is sometimes referred to as the “ultimate loop calibrator” because it expands on the 787B with more power and additional features.
Key Features:
- Built-in 24 V loop power supply, eliminating the need for an external power source.
- Larger dual-display with backlight for easy viewing in low light.
- Higher drive capability for current loops.
- 2x 9V batteries for extended runtime.
- All the same multimeter and mA sourcing/simulation functions as the 787B.
Best For: Professionals who regularly work with process control loops and want an all-in-one tool that can both power and measure loops.
⚖️ Fluke 789 vs 787B: Head-to-Head
| Feature | Fluke 787B | Fluke 789 |
|---|---|---|
| Loop Power Supply | ❌ No built-in supply | ✅ Yes, 24 V built-in |
| Display | Standard LCD | Dual display, backlit |
| Battery Power | Single 9V | Two 9V batteries |
| Size & Weight | Compact, lighter | Slightly bulkier |
| Use Case | Troubleshooting & measuring loops | Full loop calibration including powering loops |
| Price | Lower cost | Higher cost |
✅ Pros and Cons
Fluke 787B
✔ Compact and portable
✔ Lower cost than 789
✔ Full DMM and loop calibration functionality
✘ No built-in loop power
✘ Smaller display
Fluke 789
✔ Built-in 24 V loop power supply
✔ Larger, dual backlit display
✔ Ideal for full loop setup and calibration
✘ Bulkier and heavier
✘ More expensive
📝 Which One Should You Choose?
- Choose the Fluke 787B if you want a reliable, portable ProcessMeter at a lower cost and don’t need onboard loop power.
- Choose the Fluke 789 if you work with process loops daily and need the convenience of a built-in power supply and larger display.
In short, the 787B is the lighter, budget-friendly choice, while the 789 is the powerhouse tool for advanced process technicians.