• Usually ships in 3-5 business days



  • Humidity: 0 to 100% RH (Model 42275 only)
  • Temperature: -40° to 185°F
  • Sampling rate from 1sec to 2hrs
  • Battery life up to 1 year
  • Hi/Lo limits with alarm indication
  • Windows® XP, Win 7, Win 8 compatible software
  • Real time clock
  • Water resistant
  • 3 start methods (scheduled, immediate, & magnetic)
  • USB docking station required for operation


The Extech 42270 data loggers allow you to take and store humidity and temperature readings from nearly any space and at nearly any interval. the Extech 42270 humidity/temperature data logger stores up to 16,000 readings (8,000 humidity readings and 8,000 temperature readings).

Extech 42270 data loggers allow users to view temperature and humidity on the LCD display. A real-time clock stores date & time with data. Extech 42270 feature three start methods: scheduled, immediate, or magnetic. The sampling rate is programmable from 1 second to two hours. Additionally, programmable Extech 42260 & 42270 data loggers are equipped with hi/lo limits and alarm indication and can store and analyze results using the Windows® XP, Win 7, Win 8 compatible software.

The Extech 42270 are available as data loggers only or as kits which include the data loggers as well as USB docking station and software. Please note that the data logger only is meant as a replacement. The data logger cannot function without the software and USB docking station. Multiple units can be programmed with one docking station.

Applications for Extech 42275 Data Logger Kit include

  • Clean rooms
  • Refrigerator
  • Freezer
  • Shipping vans
  • Shipping crates
  • Cargo vessels
  • Storage areas
  • Warehouses