Testo 175H1 - Temperature & Humidity Data Logger

Brand: Testo

The testo 175H1 temperature and humidity data logger features a large display and alarm indication that makes it ideal for continuous monitoring of ambient temperature and humidity.

The 175H1 has an external, stub type humidity sensor, making it best-suited for use in high humidity areas.

Creation of Excel Spreadsheets, PDFs, and data analysis are all easily achieved with the free, downloadable ComSoft software.

The testo 175H1 is an ideal data logger for the continuous monitoring of ambient temperatures and humidity.

With its customizable alarm, the 175H1 will alert when user defined thresholds have been exceeded.

Please note: The testo 175H1 temperature measurement logger requires an interface to use the free data logger software. One interface can be used for multiple instruments.
  • Internal thermistor for temperature and capacitive humidity sensor
  • Data transfer possible using the USB port, or SD card (optional)
  • Easy to read large display that shows current reading and exceeded measurement limits
  • IP54 protection class
  • Capable of CFR 21 Part 11 Compliancy
  • Free data logger software available for download
  • Data is secured within the logger, and can be password protected using ComSoft
  • Includes lockable wall mount to prevent theft or tampering
  • Professional software with Excel export function for programming the logger and data analysis
  • Round-the-clock monitoring and logging of temperature, relative humidity and dew point
  • Temperature measuring range from -20°C to +70°C
  • Automatic measuring data backup when the battery runs out or is changed
  • Transfer of measuring data via SD card
  • Displays violations of limit values



Delivery Scope

  • Testo 175H1 Temperature Data Logger, Batteries, Wall Mount, Lock, and Certificate of Conformity


  • 4.59 oz. / 130 g


  • 6 x 2 x 1 in. / 149 x 53 x 27 mm

Operating Temperature

  • -4°F to 131°F / -20°C to +55°C


  • Plastic

Protection Class

  • IP54


  • 2 Internal

Product Colour

  • Black

Life-time Sensor

  • Long-term Drift of the Sensor <1% RH / year (Ambient Temperature + 25°C)


  • EU-guideline 2014/30/EU; 2011/65/EU

Measuring Rate

  • 10 s - 24 h

Battery Type

  • 3 x AIMn type AAA or Energizer

Battery Life

  • 3 years (15 min. meas. rate, +25 °C)


  • 1,000,000 Measuring Values

Storage Temperature

  • -4°F to 131°F / -20°C to +55°C

Temperature - NTC

  • Measuring Range: -4°F to 131°F / -20°C to +55°C
  • ±0.7°F (-4°F to 131°F) ±1 Digit / ±0.4°C (-20°C to +55°C) ±1 Digit
  • Resolution: 0.1°F / 0.1°C

Humidity - Capacitive

  • Measuring Range: 0 to 100 %rH*
  • * Not for Condensing Atmospheres
  • Accuracy: ±2 %rH (2 to 98 %rH at 77.0°F / ±2 %RH (2 to 98 %RH) at +25°C | ±0.03 %rF/K ±1 Digit | < ±1 %rH / year drift at +77°F / < ±1 %RH / year drift at +25°C
  • Resolution: 0.1 %rH

Dewpoint (Calculated)

  • Measuring Range: -40°C to 50°C td
  • Accuracy: 0.0 %rF/K

  • Monitoring and Documentation of Building Air Conditioning
  • Monitoring and Documentation of the Storage Temperature and Humidity
  • Monitoring and Documentation of the Transportation Temperature and Humidity
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