There are a variety of models with either internal or external sensors for recording humidity, temperature and pressure.

• Temperature switchable from Fahrenheit to Celsius
  
• Economically priced
  
• Comes complete with SmartGraph software, RS232 cable and manual — everything needed to record and download
  
• NIST Certification and Antitheft Wall Mounting Device are optional

• With display
  
• Internal Sensors — nothing else needed to record and download
  
• Temp. Range: -4 to 122°F (switchable to Celsius, ±0.3°(32 to 104°F) accuracy

• External Sensors (purchase separately)
  
• Ranges
  • Temperature: -4 to 122°F (-20 to 50°C)
  • Accuracy: ±0.3°C at -0 to 40°C (otherwise ±0.5°C)
  • Resolution: 0.1°C at -20 to 50°C
  • Relative Humidity: 0 to 95%
  • Accuracy: ±3% RH
  • Resolution: 0.5%

• Internal Sensors
  
• Range
  • Temperature: -4 to 122°F (-20 to 50°C)
  • Accuracy: ±0.3°C (0 to 40°C) otherwise ±0.5°C
  • Resolution: 0.1°C
  • Air Pressure: 750 to 1100 hPa
  • Accuracy: ±0.5 hPa at 25°C ±1.0 hPa for -10°C<T<60°C
  • Long Term Stability: -1.0 hPa
  • Resolution: 0.1 hPa

• Two thermocouple capacity
  
• Purchase J or K Thermocouples separately
  
• Measuring Range: 392 to 2190°F (-200 to 1200°C)
  
• Accuracy: ±1°C (at 20°C)
  
• Resolution: 0.2°C