The Fluke 59, also sold as the Fluke 59 Mini, and the Fluke 59 MAX occupy a similar place in Fluke’s infrared thermometer lineup. Both are compact, single-laser IR thermometers designed for quick non-contact surface-temperature measurements.
At first glance, there does not appear to be much separating them. Both have an 8:1 distance-to-spot ratio, both respond in under half a second, and both have roughly 2% basic accuracy.
But the 59 MAX is a significantly more capable instrument.
It has a wider temperature range, adjustable emissivity, MIN/MAX/AVG/DIF measurements, high and low alarms, better display resolution, a more rugged enclosure and substantially longer battery life.
Both are dependable Fluke infrared thermometers, but the Fluke 59 MAX is our overall pick.
- Choose the Fluke 59 Mini for simple, occasional surface-temperature checks.
- Choose the Fluke 59 MAX for adjustable emissivity, a wider temperature range and more troubleshooting functions.
Bottom line: For most buyers, we would choose the Fluke 59 MAX. The older Fluke 59 Mini still makes sense if you find it considerably cheaper and simply need quick measurements of common high-emissivity surfaces.
Fluke 59 vs 59 MAX: Quick Comparison
| Feature | Fluke 59 Mini | Fluke 59 MAX |
|---|---|---|
| Temperature range | -18°C to 275°C (0°F to 525°F) | -30°C to 350°C (-22°F to 662°F) |
| Distance-to-spot ratio | 8:1 | 8:1 |
| Response time | <500 ms | <500 ms |
| Basic accuracy | About ±2% | About ±2% |
| Emissivity | Fixed at 0.95 | Adjustable from 0.10 to 1.00 |
| Resolution | 0.2°C | 0.1°C |
| Laser | Single | Single |
| MIN/MAX/AVG/DIF | No | Yes |
| High/low alarms | No | Yes |
| Backlit display | Yes | Yes |
| Battery | 9V | 1 × AA |
| Rated battery life | 4 hours | 12 hours with laser and backlight on |
| Weight | 200 g | 220 g |
| Drop rating | Not specified | 1 meter |
| IP rating | Not specified | IP40 |
| Best choice for | Simple surface checks | General professional use |
Fluke specifies the 59 Mini for -18°C to 275°C, with fixed 0.95 emissivity and an 8:1 optical ratio. The 59 MAX expands the range to -30°C to 350°C and adds adjustable emissivity from 0.10 to 1.00 while retaining the same 8:1 optics.
The Fluke 59 Mini is the better fit if you want a straightforward infrared thermometer without extra settings or modes.
- Measures from -18°C to 275°C
- 8:1 distance-to-spot ratio
- Fast, simple point-and-shoot operation
- Backlit display
- Compact and easy to keep in a service kit
The Biggest Difference Is Adjustable Emissivity
This is arguably the most important reason to choose the Fluke 59 MAX.
The Fluke 59 has its emissivity permanently set at 0.95. That is a good setting for many everyday materials including painted surfaces, wood, plastics and other relatively high-emissivity materials.
The 59 MAX allows emissivity to be adjusted from 0.10 to 1.00.
Why does that matter?
An infrared thermometer does not directly measure the temperature of an object. It measures infrared radiation coming from its surface and calculates a temperature from it. Different surfaces radiate infrared energy differently.
The Fluke 59 MAX is the more capable thermometer and the model we would choose for most professional and serious DIY use.
- Wider -30°C to 350°C measurement range
- Adjustable emissivity from 0.10 to 1.00
- MIN, MAX, AVG and DIF measurement modes
- High and low temperature alarms
- 0.1°C display resolution
- Runs from a convenient AA battery
Shiny metals can be particularly troublesome. Fluke points out that polished or unpainted metals can have much lower emissivity than painted, oxidized or non-metallic surfaces. Using an incorrect emissivity value can therefore produce surprisingly inaccurate temperature readings.
For example, if you regularly check:
- Bare aluminum
- Copper
- Stainless steel
- Metal pipes
- Electrical bus bars
- Metallic machine components
the adjustable emissivity of the 59 MAX can be valuable.
That does not automatically make the 59 MAX accurate on every shiny surface. IR temperature measurement of polished metal is inherently difficult. Sometimes the best approach is still to place electrical tape or another known high-emissivity material on the surface and measure that instead.
For painted surfaces, walls, plastic housings, rubber, wood and similar materials, the fixed 0.95 emissivity of the Fluke 59 is much less limiting.
Winner: Fluke 59 MAX
Temperature Range
The Fluke 59 measures from:
-18°C to 275°C (0°F to 525°F)
The Fluke 59 MAX measures from:
-30°C to 350°C (-22°F to 662°F)
That gives the MAX an additional 75°C at the hot end and an additional 12°C at the cold end.
For ordinary HVAC diagnostics, household troubleshooting and many electrical applications, the difference may not matter much.
Both easily cover things such as:
- HVAC vents
- Radiators
- Electrical panels
- Motors
- Pumps
- Refrigeration equipment
- Cooking surfaces
- Automotive cooling systems
The MAX becomes more useful when checking hotter industrial equipment, heating elements, exhaust components or other surfaces that may exceed the 275°C limit of the original 59.
Winner: Fluke 59 MAX
Accuracy
Surprisingly, accuracy is not a major reason to upgrade.
The Fluke 59 Mini is specified at ±2°C between 0°C and 100°C and ±2% of the reading from 100°C to 275°C.
For temperatures of 0°C and above, the 59 MAX is specified at ±2°C or ±2% of the reading, whichever is greater. Both also specify repeatability of approximately ±1% or ±1°C, whichever is greater.
In other words, on a suitable surface under good measurement conditions, you should not expect the 59 MAX to suddenly produce dramatically more accurate readings.
Its advantage is versatility rather than basic sensor accuracy.
Because you can adjust emissivity, the MAX gives you more control when measuring different surface types.
Winner: Tie for basic accuracy, 59 MAX for difficult surfaces
Both Have an 8:1 Distance-to-Spot Ratio
Both thermometers use an 8:1 distance-to-spot ratio.
At approximately 8 inches from your target, the thermometer is therefore measuring an area roughly 1 inch in diameter. As you move farther away, the measurement area gets larger.
This is important because the laser is only an aiming aid. It does not represent the entire area being measured.
Fluke specifically warns that the target should be larger than the IR thermometer’s measurement spot. If you stand too far away from a small target, the thermometer can pick up surrounding surfaces and give you a misleading result.
So despite having laser pointers, neither thermometer should be considered a precision long-distance instrument.
For measuring something small such as an electrical terminal, small pipe or electronic component, get relatively close.
Winner: Tie
The 59 MAX Has Much Better Measurement Functions
The original Fluke 59 is deliberately simple.
Point it at something, pull the trigger and read the temperature.
The 59 MAX adds several useful functions:
- Minimum temperature
- Maximum temperature
- Average temperature
- Difference between minimum and maximum
- High temperature alarm
- Low temperature alarm
These can be genuinely useful for troubleshooting.
For example, when moving across several breakers in an electrical panel, MAX mode can help identify the hottest point. When checking HVAC vents, MIN or AVG can be useful for comparing readings. High and low alarms can quickly flag measurements outside a predetermined range.
These are not features everyone needs, but they turn the 59 MAX into more of a diagnostic instrument rather than simply a temperature gun.
Winner: Fluke 59 MAX
Display Resolution
The Fluke 59 has a display resolution of:
0.2°C / 0.5°F
The Fluke 59 MAX improves this to:
0.1°C / 0.2°F
Do not confuse resolution with accuracy. Seeing an additional decimal place does not mean the actual temperature measurement is twice as accurate.
Still, the finer display is useful when looking for small temperature changes or comparing several measurements.
Both thermometers have backlit displays.
Winner: Fluke 59 MAX
Battery Life
Here the difference is substantial.
The Fluke 59 Mini uses a 9V battery and Fluke specifies approximately 4 hours of battery life.
The Fluke 59 MAX runs on a single AA battery and is rated for approximately 12 hours even with the laser and backlight operating.
AA batteries are also inexpensive and considerably easier to find than 9V batteries.
For something that lives in a service kit or toolbox, we strongly prefer the MAX’s AA arrangement.
Winner: Fluke 59 MAX
Size and Durability
The original 59 weighs about 200 g including its battery, compared with approximately 220 g for the 59 MAX.
The difference is minor.
The 59 Mini does live up to its name and is easy to carry, but the MAX is still a very compact tool.
Fluke gives the 59 MAX a one-meter drop rating and an IP40 ingress-protection rating. It is clearly designed with service and industrial use in mind.
The 59 Mini’s published specifications do not provide the same explicit drop and IP ratings.
Winner: Fluke 59 MAX
For most buyers, our recommendation is the Fluke 59 MAX. The two models have similar basic accuracy and the same 8:1 optics, but the MAX adds features that make it useful in a much wider range of real-world measurement situations.
What Customers Say About the Fluke 59 and 59 MAX
Customer feedback on these two thermometers is interesting because it is not completely consistent across different websites.
Fluke 59 Mini Feedback
The older Fluke 59 has a relatively straightforward reputation.
In an infrared-thermometer discussion on the Overclockers Australia forum, one technician specifically mentioned keeping a Fluke 59 in his service kit, while noting its 275°C temperature limit. That is probably a good description of where the 59 fits best today: a basic, dependable service thermometer rather than a feature-heavy instrument.
The 59 Mini has also been recommended in the electricians community on Reddit as a dedicated IR thermometer rather than relying on a multi-function tool with a built-in temperature feature.
Retailer feedback we found for the 59 Mini was also positive. Moglix showed a 4.7/5 average from seven ratings when checked, with buyers commenting particularly on its compact size and ease of carrying. That is a small review sample, so we would not put too much weight on the exact score, but the comments fit the 59 Mini’s primary advantage: simplicity.
Fluke 59 MAX Feedback
Feedback surrounding the 59 MAX is considerably more mixed.
In the Amazon feedback we reviewed for our separate Fluke 59 MAX review, the thermometer had an average of approximately 4.3 stars from more than 200 ratings. Recurring positive themes included accuracy, ease of use, good battery life and confidence in the readings compared with inexpensive IR thermometers. Some owners described using it for HVAC work, cooler checks, heat presses and general troubleshooting.
Another retailer, Moglix, showed a 4.4/5 average across 20 ratings, where positive reviews repeatedly mentioned ease of use, durability and accuracy.
However, there is an important counterpoint.
Fluke’s own product page currently displays only a handful of reviews, and they are unusually negative. Complaints include units that allegedly became intermittent or stopped working, along with owners who believed their temperature readings were inaccurate.
That discrepancy is worth discussing.
Some negative reviews may represent genuine defective units. We would not dismiss reports of displays or electronics failing.
But several of the accuracy complaints describe testing the thermometer using things such as boiling water, ice water or human body temperature.
Those are not necessarily reliable ways to judge a general-purpose industrial IR thermometer.
Infrared measurements depend strongly on surface emissivity, measurement distance, spot size, reflections and environmental conditions. Steam can interfere with measurements, shiny surfaces can produce substantial errors, and a general-purpose industrial IR thermometer is not the same instrument as a calibrated medical forehead thermometer. Fluke itself stresses these factors when explaining IR thermometer measurement and calibration.
So we would interpret the owner feedback this way:
The large body of customer feedback suggests most 59 MAX owners are satisfied, but the model is not immune to reliability complaints, and it requires some understanding of how infrared thermometers work to obtain trustworthy results.
Why Two IR Thermometers Can Give Different Temperatures
This issue deserves emphasis because it explains many complaints about infrared thermometers in general.
Imagine pointing both thermometers at a shiny stainless-steel pipe.
The actual pipe might be 100°C.
The Fluke 59 assumes an emissivity of 0.95 because its emissivity is fixed.
But the surface may have a much lower actual emissivity.
The resulting displayed temperature can therefore be substantially different from the true surface temperature.
With the 59 MAX, you can adjust the emissivity setting to better match the surface.
An alternative is to put a piece of matte electrical tape on the pipe, allow it to reach the same temperature and measure the tape instead. Fluke specifically recommends techniques like this for difficult shiny surfaces.
This is one of the strongest arguments for buying the 59 MAX if you intend to use the thermometer professionally.
Fluke 59 Advantages
The Fluke 59 Mini still has a few advantages:
- Slightly lighter
- Extremely simple operation
- Good enough for many common surfaces
- Same 8:1 optical ratio as the MAX
- Similar basic accuracy
- Potentially attractive if found at a substantially lower price
If all you need is a temperature gun for occasional HVAC, household or workshop checks, there is nothing fundamentally wrong with the older 59.
Fluke 59 MAX Advantages
The 59 MAX gives you:
- Wider -30°C to 350°C measurement range
- Adjustable 0.10 to 1.00 emissivity
- MIN/MAX/AVG/DIF modes
- High and low temperature alarms
- Finer 0.1°C display resolution
- Approximately three times the specified battery life
- Convenient AA battery
- One-meter drop rating
- IP40 protection
Most importantly, adjustable emissivity makes the MAX more useful across a wider variety of materials.
Which One Should You Buy?
For most people choosing between the two today, we recommend the Fluke 59 MAX.
The basic accuracy and 8:1 optics are similar, so the word “MAX” does not mean that it is automatically much more accurate.
Instead, you are getting a more versatile instrument.
The wider temperature range is useful, but adjustable emissivity is the feature that matters most. Add the diagnostic measurement modes, alarms, better battery system and more rugged construction, and the 59 MAX is clearly the more complete thermometer.
The Fluke 59 Mini is worth considering if it is significantly cheaper and your measurements are primarily on painted, plastic, wood, rubber or other high-emissivity surfaces.
For technicians working with many different materials, particularly metals, we would pay the extra amount for the MAX.
For most buyers, our recommendation is the Fluke 59 MAX. The two models have similar basic accuracy and the same 8:1 optics, but the MAX adds features that make it useful in a much wider range of real-world measurement situations.
Final Verdict
The Fluke 59 and Fluke 59 MAX share the same basic concept, but they are aimed at slightly different users.
Choose the Fluke 59 Mini if: you want an uncomplicated IR temperature gun for quick measurements and can get it at a good price.
Choose the Fluke 59 MAX if: you want a more versatile troubleshooting tool, expect to measure different surface materials, need temperatures above 275°C, or value functions such as MIN/MAX/AVG and temperature alarms.
For a homeowner making occasional checks, either will work.
For HVAC, electrical, automotive and industrial troubleshooting, the Fluke 59 MAX is our pick.