The Fluke 51 II contact digital thermometer is one of Fluke’s precision instruments for measuring contact temperature in industrial and laboratory environments. The device supports J, K, T, and E type thermocouples, and its measurement accuracy is ±(0.05% + 0.3°C).
Fluke 51 II is designed as a single-channel model and features data logging of MIN, MAX, and AVG, along with a relative time timer, which is very useful for checking temperature changes over time.
A dust- and splash-resistant body, together with a shock-absorbing holster, makes this model suitable for harsh industrial environments. The large backlit display allows easy reading of data even in low-light conditions.
The thermometer is powered by three AA batteries, providing up to 1,000 hours of useful life. The measurement range varies depending on the thermocouple type; for type K it includes −200°C to +1372°C.
🔹 Key Features of Fluke 51 II
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Very high accuracy: ±(0.05% + 0.3°C)
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Supports J, K, T, and E type thermocouples
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Single input (Single Input)
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Large backlit display
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Displays MIN / MAX / AVG and relative time timer
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Dust and splash resistant design (Splash & Dust Resistant)
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Long battery life up to 1,000 hours with AA batteries
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Displays temperature in °C, °F, or Kelvin
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Battery compartment door accessible without breaking the calibration seal
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Protective holster and industrial design suitable for work environments
🔹 Technical Specifications (Fluke 51 II)
| Feature | Value |
|---|---|
| Thermocouple input | J, K, T, E |
| Measurement accuracy above −100°C | ±(0.05% + 0.3°C) |
| Measurement accuracy below −100°C | ±(0.20% + 0.3°C) for J/K/E and ±(0.50% + 0.3°C) for T |
| Temperature range (J-type) | −210°C to +1200°C |
| Temperature range (K-type) | −200°C to +1372°C |
| Temperature range (T-type) | −250°C to +400°C |
| Temperature range (E-type) | −150°C to +1000°C |
| Temperature scale | °C, °F, or Kelvin |
| Display resolution | 0.1°C (<1000); 1°C (≥1000) |
| Power supply | 3 × AA battery |
| Battery life | Approximately 1,000 hours |
| Weight | Approximately 400 g |
| Dimensions (L×W×D) | 173 × 86 × 38 mm |
| Operating temperature range | −10°C to +50°C |
| Warranty | 3 years |
❓ Frequently Asked Questions (FAQ)
Question 1: Does Fluke 51 II support Type N or R/S thermocouples?
Answer: This model standardly supports Type J, K, T, and E thermocouples. Using other types requires special equipment.
Question 2: Is the device suitable for harsh industrial environments?
Answer: Yes. The rugged design, dust- and splash-resistant body, and protective holster make this model highly reliable in industrial settings.
Question 3: Is it possible to record and view MIN, MAX, and AVG data?
Answer: Yes. The device can store and display minimum, maximum, and average values together with the relative measurement time.
Question 4: What is the battery life, and what type of battery does it use?
Answer: The device uses three AA batteries and provides up to approximately 1,000 hours of continuous operation.
🔚 Conclusion
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