The Fluke 50D is a dual-input digital thermometer that measures temperature from J-type and K-type thermocouples with 0.1 °C (0.2 °F) resolution across its full operating range. Engineered for industrial, laboratory, and field applications, it delivers K-type accuracy of 0.1% + 0.7 °C (1.3 °F) and J-type accuracy of 0.1% + 0.8 °C (1.4 °F) under standard ambient conditions. The instrument simultaneously displays readings from two thermocouple inputs, calculates differential temperature (T1-T2), and logs minimum and maximum values—making it essential for process monitoring, thermal diagnostics, and comparative temperature analysis.
Technical Specifications
• Temperature Range: K-type: −200 °C to 1370 °C (−328 °F to 2498 °F); J-type: −200 °C to 760 °C (−328 °F to 1400 °F)
• Accuracy: K-type: 0.1% + 0.7 °C (1.3 °F); J-type: 0.1% + 0.8 °C (1.4 °F)
• Display Resolution: 0.1 °C (0.2 °F)
• Thermocouple Inputs: Dual J and K-type connectors
• Battery: 9 V; 800 hours typical life
• Dimensions: 16.6 cm L × 7.5 cm W × 2.8 cm D (6.6 in L × 3.0 in W × 1.1 in D)
• Weight: 280 g (10 oz)
• Certifications: CE, CSA
– Key Features
• Simultaneous dual-input measurement and independent display of T1 and T2
• Differential temperature mode (T1−T2) for direct comparison between two points
• SCAN mode cycles through T1, T2, and differential readings automatically
• MIN/MAX recording captures peak and valley temperatures during measurement sessions
• HOLD function freezes display for stable reading capture
• Offset adjustment compensates for thermocouple error sources
• Selectable Celsius or Fahrenheit readout
• Yellow protective holster included
– Typical Applications
• HVAC and thermal system commissioning
• Manufacturing process temperature monitoring
• Equipment performance diagnostics
• Laboratory thermal testing and validation
• Field service and maintenance operations
– Compatibility & Integration
• Compatible with standard J-type and K-type thermocouples
• Supplied with two K-type bead probe thermocouples and C70Y holster
• Portable form factor enables one-handed operation in confined spaces
