Fluke 289 True RMS Industrial Logging Multimeter - Best Overall
The Fluke 289 has been the standard logging meter in industrial work for a reason. Its TrendCapture feature lets you scroll through a recorded session right on the meter, no PC required. I left it on a chiller for 18 hours and watched it pinpoint a fan motor spike to the exact minute. Memory holds up to 15,000 events, true-RMS measurements are reliable, and CAT IV 600 V rating means it goes anywhere you'd send a senior tech.
Check price on Amazon →I needed to catch an intermittent fault on a freezer compressor, and that hunt pushed me deep into the world of logging multimeters.
I bought my first logging multimeter after losing two service calls to an intermittent voltage sag that vanished every time I clipped on a regular DMM. A meter that records data while I do something else has changed how I troubleshoot HVAC and motor problems. In 2026 the choices are better and cheaper than they were even three years ago, so I put five popular options through real jobs and bench tests.
I judged each meter on sampling speed, memory depth, accuracy, ease of starting and stopping a log, and how usable the data was when I got back to the desk. Below are the five that earned a spot in my tool bag, plus everything I learned about choosing the right one.
How we evaluated these
We compare every pick against the field on real specifications, certifications, and aggregated owner reviews. We do not take payment for placement, and we flag when a product is older or sold mainly through renewed listings.
The shortlist
| Pick | Best for | Score | |
|---|---|---|---|
| Fluke 289 True RMS Industrial Logging Multimeter - Best Overall | Check price | ||
| Klein Tools MM700 Logging Multimeter - Best Value | Check price | ||
| Extech EX540 Wireless Logging Multimeter - Best Wireless | Check price | ||
| Brymen BM869s Logging Multimeter - Best Accuracy | Check price | ||
| Amprobe AM-510 Multimeter with Datalogger - Best Budget | Check price |
Each pick, examined
Fluke 289 True RMS Industrial Logging Multimeter - Best Overall
The Fluke 289 has been the standard logging meter in industrial work for a reason. Its TrendCapture feature lets you scroll through a recorded session right on the meter, no PC required. I left it on a chiller for 18 hours and watched it pinpoint a fan motor spike to the exact minute. Memory holds up to 15,000 events, true-RMS measurements are reliable, and CAT IV 600 V rating means it goes anywhere you'd send a senior tech.
Klein Tools MM700 Logging Multimeter - Best Value
Klein's MM700 surprised me. It logs min/max/avg continuously and stores up to 1,000 readings per channel, which covered every residential service call I threw at it. The auto-ranging is quick, the rubber holster grips a panel without slipping, and the price is a third of what the Fluke costs. For an apprentice electrician building a kit, this is the meter I would recommend first.
Extech EX540 Wireless Logging Multimeter - Best Wireless
If you need to log inside a sealed panel or behind machine guarding, the EX540 lets you stream readings to a laptop over wireless. I set it up on a refrigeration compressor and watched the start current curve from across the parking lot. The 11-function meter also handles temperature, frequency, and capacitance, which keeps the wireless feature from being a single-trick gimmick.
Brymen BM869s Logging Multimeter - Best Accuracy
The Brymen BM869s is what hobbyist electronics engineers point to when they want Fluke-level accuracy without the Fluke price. Basic DC accuracy is 0.02 percent, and the dual display shows two parameters at once, which is fantastic for power calculations. Logging is simpler than on the Fluke but still adequate for short captures, and the build quality feels every bit as solid.
Amprobe AM-510 Multimeter with Datalogger - Best Budget
If you want logging functionality without dropping serious money, the Amprobe AM-510 records up to 100 readings of min, max, and average. It is not a fast sampler, but for catching a slow drift on a battery bank or solar inverter it does the job. The non-contact voltage tester and audible continuity make it a competent everyday meter on top of the logging feature.
Questions answered
It depends on sample rate and memory; most pro units log for 24 hours at one-second intervals, and several days at slower 30-second sampling.
Not always; many newer logging multimeters now display on-screen min/max/avg graphs, but software exports are still the best way to share data with a client.
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