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Fluke · Fluke 381 Remote Display True-RMS AC/DC Clamp Meter with iFlex
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Verdict
The Fluke 381 is the clamp meter for the technician who wants to take a reading from outside the enclosure and does not want to depend on a phone. The display detaches from the clamp body and shows the measurement wirelessly, so the clamp can be left on a conductor with the panel door closed. It is a True RMS AC/DC meter with automatic ranging, a large backlit display, signal processing the manufacturer describes as stable in noisy electrical environments, and the iFlex flexible probe in the box. The 374, 377 and 378 FC meters offer distance reading through Fluke Connect with logging as a bonus; the 381 offers it with nothing to pair and no account. Owner reports support the remote display as reliable and the meter as durable. It is a full-size, higher-priced instrument, and a residential electrician will not need it.
Who It Is For
- Industrial electricians who take readings inside motor control centres and switchgear.
- Technicians working alone who would otherwise need a second person to read the meter.
- Sites where phones are not permitted or Bluetooth is unreliable inside enclosures.
Documented Specifications
| Item | Documentation |
|---|---|
| Display | Detachable remote display, large, backlit, automatic ranging |
| Measurement type | True RMS AC and DC voltage and current |
| Noise handling | Signal processing for stable readings in noisy environments |
| Flexible probe | iFlex included |
| Included | Soft carrying case |
The current and voltage limits, the wireless range of the display and the safety category rating are given on the manufacturer’s datasheet; consult the current revision for those figures.
The Remote Display in Use
Most of the danger in a live measurement comes from standing in front of an open enclosure with a meter in hand. The 381 lets the technician clamp the conductor, remove the display, close the door and read from a safer position. It also solves the awkward-reach problem: the clamp can go on a conductor at the back of a cabinet or above head height and the display stays at eye level. Because the display is a dedicated module rather than an app, there is no pairing step and no phone battery to worry about. The trade-off is that the display holds the current reading rather than a logged history; for records over time, the Fluke Connect meters are better suited.
iFlex and Noisy Environments
The included iFlex wraps around large conductors, busbars and bundles that the jaw cannot fit, and slips behind cables in crowded switchboards. It measures AC current only. The manufacturer’s note about stable readings in noisy environments refers to the digital filtering applied to the signal, which matters near drives and welding equipment where a lesser meter’s display jumps around. The automatic ranging removes selector changes during a measurement, which is useful when the display is in one hand and the other is holding the door.
Build and Handling
The 381 is a full-size clamp with a substantial jaw. The display module clips securely onto the body when not detached and the whole assembly works as a conventional clamp. Owners describe the meter as heavy but well balanced, and the soft case as adequate for the meter and the iFlex. The display module has its own battery, and owners suggest keeping spares for both units in the case, since a flat display battery makes the meter unusable as a remote instrument until it is replaced. The link needs no pairing step; the display simply detaches and continues to show the reading. For the general technique see measuring current with a clamp meter, and for choosing between this and an app-based meter, choosing a clamp meter.
Strengths
- Distance reading without a phone or app.
- True RMS AC/DC with automatic ranging and a backlit display.
- Stable readings near drives and other noise sources.
- iFlex included.
Limitations
- No data logging; the remote display shows the reading, not a history.
- Full-size and higher priced than general-purpose clamps.
- Two battery sets to maintain: clamp body and display.
How It Compares
The Fluke 374 FC reaches the same safe distance through a phone app and adds logging, at a lower price but with the iFlex optional. The Fluke 377 FC adds FieldSense non-contact voltage. For currents beyond the jaw and iFlex, the Fluke 355 is the 2000 A clamp with a 58 mm jaw.
How We Research
This review is based on the manufacturer’s published specifications, the Amazon product listing and owner reports. We did not run laboratory tests.
Recommended Tools
Products shown because their documented specifications fit this guide. Price and availability are on Amazon and can change.
Frequently Asked Questions
How does the remote display work?
The display module detaches from the clamp body and communicates with it wirelessly. The clamp stays on the conductor; the display goes with you. The manufacturer states the working range in the documentation.
Does the Fluke 381 need a phone app?
No. The remote display is self-contained. That is the main difference from the 374, 375, 376, 377 and 378 FC models, which use the Fluke Connect app for distance reading.
Is the iFlex included?
Yes. The 381 is supplied with the iFlex flexible current probe and a soft carrying case.
Does it auto range?
Yes. The listing states that the display automatically sets the correct range so the selector does not need to be changed while taking a measurement.
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