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ez Logger

Temperature and Humidity Logger for Vaccine Clinics.

Temperature Range: -35°C to +80°C / -31°F to +176°F
Humidity Range: 0% to 10%

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Download Product Brief:
ez Logger
Download a PDF of the ez Logger Quick Start Guide


  • USB Connection to PC
  • Configuration & Management Software User-selectable alarm thresholds
  • Measurement intervals from 10 seconds to over 18 hours
  • 21CFR: Part 11 software is available
  • LEDs indicate logger status
  • IP67 protection
  • RoHS compliant

This data logger measures and stores up to 16,382 relative humidity and 16,382 temperature readings over 0 to 100%RH and -35° to +80°C (-31° to +176°F) measurement ranges. The user can easily set up the logging rate and start time, and download the stored data by plugging the module straight into a PC’s USB port and running the MDAS-Pro software under Windows XP, Vista, 7, 8 and 10. Relative humidity, temperature and dew point (the temperature at which water vapor present in the air begins to condense) data can then be graphed, printed and exported to other applications.

The data logger comes with a long-life lithium battery, which can typically allow logging for a year. Status indication is via flashing red and green LEDs. The logger is protected against ingress from water and dust to IP67 standard when the plastic cap and seal are fitted.

Marathon also offers software for 21 CFR Part 11 Code of the Federal Regulations, as promulgated by the FDA.

ez Logger SKU#9045 Min. Typ. Max.
Relative Humidity
Measurement range %RH 0 100
Repeatability (short term) %RH ±0.1
Accuracy (overall error) (20-80%RH) %RH ±5.0**
Internal resolution %RH 0.5
Long term stability %RH 0.5
Measurement range °C (°F) -35 (-31) +80 (+176)
Repeatability °C (°F) ±0.1 (±0.2)
Accuracy (overall error) (20-80%RH) °C (°F) ±0.5 (±1)
Internal resolution °C (°F) 0.5 (1)
Dew Point Accuracy (overall error)
(25°C, 40-100%RH) °C (°F)
±1.1 (±2)***
Logging rate every 10s every 12hr
Operating temperature range °C (°F) -35 (-31) +80 (+176)
1/2AA 3.6V Lithium Battery Life 1* year

*Depending on sample rate, ambient temperatures and use of alarm LEDs
** This specifies the overall error in the logged readings, for relative humidity measurements between 20 and 80%RH
*** This specifies the overall error in the calculated dew point, for relative humidity measurements between 40 and 100%RH at 25°C

MDAS-Pro Software

Centralized Monitoring:

Our MDAS-Pro software is the ideal solution for managing and analyzing data from multiple data loggers from multiple locations. With IP Address access MDAS-Pro is location independent so data loggers located anywhere can be centrally monitored and managed.

Marathon’s Data Analysis Software (MDAS) allows you to view up to 16 multiple traces at one time, enables you to transfer the information recorded in the logger to your computer, and to view, print and generate a report of the measurement data. The graphic representations include rotating 3D views, unlimited zooms, view temperature data points on the graph, view the total elapsed time or the exact time when it was recorded.

The graph and all data points (date, time and temperature) can be printed, as well as the ability to add a Note to the file for including information pertinent to that graphic trace. Users have the ability to view the numeric data within a screen window, calculate the Mean Kinetic Temperature of the recording as well as export data in a CSV format. A summary report showing the Start and Stop Time, High, Low, Median and Average temperatures as well as the Alarm information is also displayed. The data from the logger is downloaded to your PC via our proprietary RS232 serial interface cable or USB interface.

MDAS-Pro offers language support for English, French, German, Portuguese and Spanish. A separate installation program for Chinese and Japanese is also available on the CD-ROM with this version of the software. The software has been designed for the Microsoft operating system platforms and is compatible with Windows XP, Vista, 7, 8 and 10.

ez Logger Screenshot
Sample plot using MDAS-Pro for the configuration and graphing software
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