Fluke 773 vs Fluke 772: Which Process Clamp Meter Should You Buy?

If you work with 4–20 mA process control loops, both the Fluke 772 and Fluke 773 are excellent tools that let you measure current without breaking the loop. This can dramatically reduce troubleshooting time in industrial plants, HVAC controls, and process automation systems.

The two meters share the same core platform, but the Fluke 773 adds several voltage measurement and sourcing capabilities that make it a much more versatile troubleshooting instrument.

Comparison Table

Feature	Fluke 772	Fluke 773
Non-contact 4–20 mA measurement	✅	✅
4–20 mA Source	✅	✅
4–20 mA Simulation	✅	✅
24 V Loop Power	✅	✅
Automatic Ramp Output	✅	✅
25% Step Output	✅	✅
Remote Clamp Jaw	✅	✅
Dual Backlit Display	✅	✅
Measure DC Voltage	❌	✅ (up to 30 V)
Source DC Voltage	❌	✅ (0–10 V)
Simulate Voltage Signals	❌	✅
Best For	Process loop technicians	Full instrumentation troubleshooting

What Both Meters Do Well

Both meters are designed specifically for instrumentation technicians who regularly work on process control loops.

Common features include:

• Measure 4–20 mA without breaking the loop
• Best-in-class 0.2% accuracy
• Source 4–20 mA signals
• Simulate transmitters
• Supply 24 V loop power
• Remote clamp jaw for tight panels
• Dual backlit display showing mA and loop percentage
• Automatic output ramp and step functions
• 99.9 mA measurement capability for legacy systems

Fluke 772 Overview

The Fluke 772 is aimed squarely at process technicians who spend most of their day troubleshooting current loops.

It eliminates the need to disconnect wiring simply to measure loop current, making diagnostics significantly faster and safer.

For many maintenance technicians, it provides everything required for routine transmitter testing.

Pros

• Lower purchase price
• Measures 4–20 mA without breaking the loop
• Sources and simulates mA signals
• Built-in 24 V loop power
• Excellent accuracy
• Remote clamp jaw works well in crowded panels

Cons

• Cannot measure voltage
• Cannot source 0–10 V signals
• Less versatile for mixed-signal troubleshooting

Fluke 773 Overview

The Fluke 773 includes every feature found in the 772 while adding voltage capabilities.

The biggest additions are:

• DC voltage measurement
• 0–10 V sourcing
• Voltage signal simulation

These features make it useful for troubleshooting HVAC controllers, analog PLC I/O, valve positioners, actuators, and many industrial automation systems where both current and voltage signals are encountered. (Instrumart)

Pros

• Everything included in the 772
• Measures DC voltage
• Sources 0–10 V signals
• Simulates voltage outputs
• Replaces multiple field instruments
• Excellent for PLC and instrumentation work

Cons

• Higher purchase price
• Extra features may never be used by technicians who only service current loops

---

Performance Comparison

Current Loop Troubleshooting

Both meters perform virtually identically when measuring and calibrating 4–20 mA loops.

Winner: Tie

---

Instrument Calibration

Again, both perform the same for current loop calibration.

Winner: Tie

---

PLC and HVAC Controls

The Fluke 773 is clearly ahead because it can troubleshoot both voltage and current devices.

Winner: Fluke 773

Overall Value

If your work never involves voltage signals, the 772 delivers nearly identical performance for less money.

If you regularly encounter both signal types, the 773 can replace multiple instruments.

Winner: Depends on your application

Pros and Cons at a Glance

Fluke 772

Advantages

• Lower cost
• Outstanding 4–20 mA capability
• Compact and easy to use
• Excellent for dedicated process technicians

Disadvantages

• No voltage measurement
• No voltage sourcing
• Less flexible in mixed-control environments

Fluke 773

Advantages

• Adds voltage measurement and sourcing
• One tool for current and voltage diagnostics
• Better suited to instrumentation engineers
• Reduces the number of tools carried into the field

Disadvantages

• More expensive
• Additional functions may be unnecessary for current-loop-only work

What Customers Think

Owners of both models consistently praise how much time they save by measuring 4–20 mA loops without breaking the circuit, eliminating unnecessary downtime. The detachable remote jaw is frequently highlighted as a major advantage when working inside crowded control cabinets. Users who own the Fluke 773 often mention that its voltage measurement and 0–10 V sourcing capabilities allow them to leave a second meter behind, making it particularly valuable for PLC, HVAC, and instrumentation work. By contrast, technicians whose work focuses exclusively on current loops generally feel the Fluke 772 provides all the functionality they need at a lower cost. Community discussions echo this view, with many noting that the primary reason to upgrade to the 773 is its added voltage capabilities.

Which Should You Buy?

Buy the Fluke 772 if:

• You mainly troubleshoot 4–20 mA loops.
• You work primarily with transmitters.
• You don’t need voltage sourcing or measurement.
• You want the best value.

Buy the Fluke 773 if:

• You service PLCs and industrial control systems.
• You work with both voltage and current analog signals.
• You want one tool instead of multiple instruments.
• You frequently troubleshoot HVAC controls or valve positioners.

Final Verdict

For technicians whose work revolves around 4–20 mA process loops, the Fluke 772 remains an outstanding value and performs almost identically to the 773 in current-loop applications.

However, if your job regularly involves 0–10 V control signals, PLC analog I/O, HVAC systems, or mixed instrumentation, the Fluke 773 is the more capable long-term investment. Its additional voltage functions make it a true all-in-one process troubleshooting tool rather than simply a loop clamp meter.