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Product Selection Guide: Contact thermometers

Use our product selection guide to find the thermometer that fits your needs best.
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Fluke 51 II Single Input Digital Thermometer 1
Fluke 568 Ex Intrinsically Safe Infrared Thermometer
Fluke 51 II Handheld Digital Probe ThermometerFluke 568 Ex Intrinsically Safe Infrared Thermometer
Recommended usesLaboratory, quality assurance, process calibration, food safety, HVACElectrical, refining, pharmaceutical, process industries, mechanical, plant, diesel, HVAC 
Probe typeThermocouple K, J, T, EThermocouple K 
Number of inputs11 
Temperature rangeT-type: -250 °C to +400 °C (-418 °F to +752 °F)-270 °C to +1372 °C (-454 °F to +2501 °F) 
What temperature range do you need to measure?500 °C (+932 °F)-40 °C to +800 °C (-40 °F to +1472 °F) 
Will you be working from greater than 5 m (15 ft)?  
Will you be measuring objects 200 °C (400 °F), moving, uncontaminatable, energized objects or difficult to reach objects?  
Non-contact temperature range500 °C (+932 °F)-40 °C to +800 °C (-40 °F to +1472 °F) 
AccuracyGreater of ± 1 % or ± 1.0 °C (± 2.0 °F) 
Distance to spot (D:S)50:1 
SightingLaser point 
Typical distance to targetUp to 7.5 m (25 ft) 
Form factorFlatPistol 
Dimensions, approximate (H x W x D)17.3 x 8.6 x 3.8 cm (6.8 x 3.4 x 1.5 in)17.69 x 5.18 x 16.36 cm (6.965 x 2.039 x 6.441 in) 
Battery3 AA3 AAA 
Warranty3 years2 years 
CaseHard case 
Temperature areaSurface temperatureInternal, ambient and non-contact surface temperature 
Do you want to use industry standard thermocouples?   
Will you use the thermometer in a hazardous location where there might be explosive gases?  
Time stampRelative 
Min-Max-Avg-DifMin-Max-Avg-DifMin-Max-Avg-Dif 
Soft-key feature menu navigation  
Multiple language interface  
English, French, Chinese, Spanish, Portuguese, German user interface  
Material type adjustment (emissivity)Material table or 0.1 to 1.00 by 0.01 
High and low alarmsHigh and low alarms 
Hazardous location approval  
Hands-free logging  
Number of on-board memory locations99 
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