Product Review: Fluke 52 II dual input digital thermometer

Product Review Temperature

Product Review: Fluke 52 II dual input digital thermometer

Before we get to the Fluke 52 II, I feel the need to remind vendors that field techs and engineers need portable tools. Yeah, it sounds obvious, but it might surprise you what some vendors consider “portable.”

Anyway, a while back, I reviewed the Flexim FLUXUS F601, a relevant tool to check flow meters in the field. We had some field communicators too, such as the Field Xpert SMT70 and the AMS Trex. So you can get devices that can check multiple conditions, as you’ve seen here at Visaya. However, sometimes it makes more sense budget-wise to buy a simple version for a specific activity.

Image of Fluke 52 II dual input digital thermometer
Courtesy of

With that in mind, today we have the 52 II dual input digital thermometer from Fluke. Let’s find out if the 52 can fit in your daily activities and the pros and cons of it.  And if you decide you want one, then you can easily buy it online. I’ll hook you up with those links later.

Disclaimer: This product review examines only features, not performance. If you’ve used this device, feel free to share your experience in the comments. This content serves the purpose of providing information if you want a new device.

Whatcha got there?

First off, the Fluke 52 does a good job of being portable, fitting easily in your tool bag at 2.8 by 7.8 by 16.2 centimeters and 400 grams. For you USians, those numbers switch to 1.1 by 3 by 6.4 inches and less than a pound. It even has a holster, if you want to keep it handier. And with its simple options, you can work it without the manual.

On the upside, the display shows all the data you need for setup and measuring values; you can see battery life, thermocouple type, units, and more. On the downside, I didn’t find much information about the display size, but it looks good, so I’ll go with it. And the bonus backlight button means you can turn the backlight on and off, saving you battery juice.

image of Fluke 52 II dual input digital thermometer
Courtesy of Amazon USA

Speaking of buttons, it has a few to scroll up and down, turn it on and off,  and more that I’ll mention as I talk about the feature related to the button. It doesn’t have many buttons for setup, but it doesn’t need more. If you disagree, then drop a comment below and point the problem out.

What can it do?

The 52 has two inputs that can read four types of thermocouples – J, K, T, and E. Other models accept more options and bring more features, but this one covers a good range with its select four.

Measuring range of each type:

  • J: -210 to 1200 degrees Celsius
  • K: -200 to 1372 degrees Celsius
  • T: -250 to 400 degrees Celsius
  • E: – 150 to 1000 degrees Celsius

Now, you should know the accuracy of this thermometer, right? The Fluke 52 has an accuracy of +- 0.05 percent of reading +-0.3 degrees Celsius. But if you measure temps below 100 degrees Celsius with J, K, or E, then you need to add 0.15 percent. If you have a type T, then you need to add 0.45 percent.

Furthermore, you power it with three AA batteries, and those batteries can last 1000 hours. And the operating temperature is -10 to 50 degrees, with the humidity 0 to 90 percent in temps from 0 to 35 degrees and 0 to 70 percent from 0 to 50 degrees.

Why should I care?

First off, it’s budget-friendly, although you should compare it against other options on the market. Second off, it has a few exciting features.

The 52 accepts two sensors, and a button lets you see the measured value of T1 or T2. That button also lets you measure the difference between T1 and T2. So you can use it to measure the difference between two points in a pipe or machine or whatever. Nice, huh?

image of Fluke 52 II dual input digital thermometer
Courtesy of Amazon Germany

And the HOLD button can freeze the measuring value on the screen. I also like the MIN, MAX, and AVG values, as they give you – what else? – the minimum, maximum, and average of the measuring value.

Last but not least, you can use the offset button to adjust sensor errors. The manual gives you a simple step by step on how to adjust the offset of your sensor.


If you want a portable thermometer with fancy features and affordable price, then take a look at the Fluke 52. You can even buy it on Amazon! If you’re still not sure, then hit Visaya’s device page on the right there to review other options.

Product available on Amazon U.S. and Germany:

Fluke 52-2 60HZ Dual Input Digital Thermometer

Buy on Amazon U.S

Fluke Fluke FL52 2 Dual Input Thermometer 50 Hz 52 II

Buy on Amazon Germany

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