HM40 High Humidity Thermo-Hygrometer

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This hand-held humidity and temperature meter is compact, robust and works in high humidity environments, as found in most fresh produce coolers and ripening rooms. It is an ideal spot checking tool and continues Vaisala's reputation for accuracy and reliability.



  • Displays a wide range of quantities: RH, T, Td, Tw, a, x, h
  • Large graphic display which indicates when measurements have stabilized
  • Hold-button to freeze the screen
  • Multilingual user interface with 10 languages
  • Can be user calibrated
  • NIST traceable (certificate included)



  • Ranges:
    • Humidity: 0 to 100% RH
    • Temperature: 14°F to 140°F (-10°C to 60°C)
  • Accuracy: ±1.7% RH up to 90% RH (±2.5% RH otherwise) / ±0.36°F up to 104°F (±0.72°F otherwise)
  • Power: Two AA batteries
  • Dimensions: 230 x 72 x 44 mm
  • Weight: 240 g
User Manual:
Quick Guide: