Fluke 51 II Single Input Digital Thermometer
Original price was: $442.99.$379.83Current price is: $379.83.
Price: $442.99 - $379.83
(as of Aug 12, 2025 05:55:22 UTC – Details)
The Fluke Digital thermocouple thermometer is used for applications requiring a broad range of temperatures, including furnaces, kilns, freezers, and other industrial applications. This thermometer measures temperatures in Celsius, Fahrenheit, or Kelvin via a Type K, Type J, Type t, or Type E thermocouple probe. It comes with one or two Type K bead thermocouple probes with 40 inch.
Is Discontinued By Manufacturer : No
Product Dimensions : 1 x 1 x 1 inches; 10.58 ounces
Item model number : FLUKE-51-2
National Stock Number : 6685-01-292-2787
Date First Available : November 19, 2003
Manufacturer : Fluke Corporation
ASIN : B000VRCSX4
Best Sellers Rank: #75,879 in Industrial & Scientific (See Top 100 in Industrial & Scientific) #31 in Lab Digital Thermometers
Customer Reviews: 4.4 4.4 out of 5 stars 56 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
Thermocouple thermometer for use in applications requiring a broad range of temperatures, including furnaces, kilns, freezers, and other industrial applications
Measures temperatures in celsius, fahrenheit, or kelvin via a type k, type j, type t, or type e thermocouple probe
Includes a type k bead thermocouple probe with a 40″ cable that measures from minus 40 to +260 degrees c ( minus 40 to +500 degrees f)
Provides the relative time of minimum, maximum, and average temperature measurements for monitoring
Conforms to nist standards for compliance with regulations
Customers say
Customers praise the thermometer’s durability, with one noting its typical Fluke construction, and appreciate its accuracy and ease of use. They like its temperature measurement capabilities, with one mentioning quick readings, and one highlighting the ability to make a DIY thermocouple. While customers find the thermometer easy to use, opinions on value for money are mixed, with some finding it expensive.
8 reviews for Fluke 51 II Single Input Digital Thermometer
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Original price was: $442.99.$379.83Current price is: $379.83.
CFortC –
If you care about temperatures
Fluke has really thought out their line of digital thermometer instruments. Although this is the basic model of the line, it has all the accuracy, durability for daily field use, and flexibility to accept the various Fluke probes.The clear choice for HVAC professionals, code inspectors, laboratory work, serious hobbyists, etc.
RamblinWreck –
Great Thermometer for Weld Shop
Bought this a couple of months ago to monitor interpass temperatures in our aluminum welding shop. It’s easy to use and provides quick and accurate readings. The outside is fairly rugged and would probably survive an accidental drop from a few feet. Perfect for a weld shop. We also bought a 80PK-3A probe but in hindsight probably don’t need it – and it was pricey. The probe that comes with the unit is as basic as you can get but works fine.
Eric –
Bought this for cooking. Unbeatable durability, few features, high price
Iâm an engineer. Iâve used these thermocouple readers and other Fluke equipment in my profession for years. I bought this one for home cooking because I got tired of seeing cheap digital kitchen thermometers fail in the middle of a recipe. Hereâs the good, the bad and the ugly from a cooking standpoint:The good:1) Absolutely unrivaled durability. You could certainly break this if you tried but youâre very unlikely to ever break it by accident. I have used Fluke products at work for 15+ years and they are just all-the-way tough.2) Standard thermocouple jack. You can plug in and use just about any kind of thermocouple of any shape from any manufacturer. Itâs possible to even make a DIY thermocouple if you feel like it. If you thermocouple dies, you only have to replace it, not the reader.3) Runs on 3 ordinary AA batteries. The batteries will last a very, very long time and are cheap and easy to replace when they finally die.The bad:1) Very, very expensive for use as a kitchen thermometer. But see above. Iâve broken so many cheap ones that I could have just bought this at the start and never had a failure.2) Very few features, and the features it does have are not tailored to cooking. In particular, this model does not have a temperature alarm. You just have to keep an eye on it. You could probably buy a Fluke reader with a temperature alarm but it would cost even more.3) Ships with a basic, bare type K thermocouple that is not appropriate for cooking use. Youâll have to spend about $20 more to buy a stainless steel probe shaped thermocouple suitable for cooking.The ugly:1) Itâs industrial-grade equipment. It looks like it belongs in a factory or a laboratory because thatâs what itâs designed for. With the right thermocouple itâs perfectly safe to use in the kitchen but it looks out of place. Personally, I like that. If you have a spouse or significant other who might be concerned then you might want to ask him/her/them about it before you spend the money.Overall, minus one star for the high price and lack of features. Iâm sure Fluke makes a handsome profit off of every one of these they sell. I can’t fault Fluke for the “bad” points because they didn’t intend this to be a kitchen thermometer. If you just want a very basic but very reliable thermocouple reader for industry or for the kitchen, this one will do the job.
Bellevue –
Accurate
With all fluke products they are a little on the spendy side but they are reliable and hold up great!
Guzman808 –
Too expensive for it to break that easy
Item broke after a few weeks of use outside of return policy
David R. Todd –
Like the rubber shroud
The Fluke unit easily fits in one hand so it is easy to use in our shop. The rubber housing is a big plus as the equipment is moved around often and will see some bumps and scrapes. The digital screen is easy to read and temp readings are quick. I will be purchasing additional units soon as this model is well suited for a manufacturing environment.
Erik Olsen –
Very Durable thermometer.
A little expensive compared to some of this unit’s competition. But very durable and quite accurate.
K –
Little bulky
works great. But it is a little bit big and bulky. Somewhat hard to change the batteries in it since you need a screwdriver and you have to remove the thick rubber protector on the outside.