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microDL Digital Display Temperature Logger

The coin-sized temperature data logger with LCD display for instant verification of recorded information during shipping and storage.

Available Memory Sizes: 8k, 32k or 64k.
Temperature Range:
 Configuration options of -10°C TO +72°C,  -30°C to +72°C or -40°C to +72°C

CALL 800-858-6872


Download Product Brief:


The microDL is a revolutionary multi-use programmable data logger for displaying and recording temperatures for shipping and storage applications. Now all of your critical biologics, cancer drugs and vaccines can be immediately temperature qualified with our display technologies. Small, yet so powerful, this investigative temperature-collecting device is your answer for regulatory compliance.

The compact, coin-sized unit with the external thermistor probe gives you on-the-spot verification that the internal temperatures of your packaged contents meet specifications prior to acceptance of your shipment. Our digital display technology  allows research laboratories and physicians to immediately validate temperature information for clinical studies and patient administration.

Flexible: Press the start button to display the following information, whether or not the logger is recording: Current Temperature, Elapsed Time in Days, MKT(Mean Kinetic Temperature), High Temperature, Low Temperature, Alarm Time over High Temperature, Alarm Time Below Low Temperature, and Alarm Conditions.

Customizable settings include: Delay to Start, Stop, Elapsed Time as well as customizable sampling time intervals. Also available: User Descriptions for initialization and for downloading the data.

Visual Alarms: All our data loggers have the ability to program alarm limits. Should the temperature reach levels outside these limits, the digital display will show a notice until reset by the user. Alarm conditions can be programmed for start/delay, high/low, continuous or cumulative time over alarm. Push the start button to view critical temperature information anytime.

Many configurations are available: Choose from 8K, 32K or 64K memory size (which determines the maximum number of data points) and the temperature range to record (temperature ranges from -10C to +72C down to -200C to -100C). Then decide on the style. Choose one without a probe, or with a stainless steel, flat ribbon, teflon coated, or detachable probe. Single-use disposables are also available.
Tell us what you need and we will assemble a configuration to suit your needs.

Computer Ready: The microDL is a state-of-the-art, water-resistant data logger with non-volatile memory for data retention. For a complete analytical solution, simply download all of its data to your PC with the proprietary microDL USB Reader and Marathon’s easy-to-use MDAS-Pro software. Compatible with Microsoft Windows XP, Vista and 7, 8 & 10. 21CFR compliant software is available with full database capabilities.

Display Examples

Press the Start button to see the following information display with each press of the start button:

1. REC – 8.6C

shows RECording and current temperature

2. RUN – 11 D

shows elapsed time in days

3. MKT – 9.1C

shows mean kinetic temperature (available on silver model only)

4. HI – 15.2C

shows alarm has occurred and high temperature

5. LOW – 8.2C

shows alarm has occurred and low temperature

6. HI HR – 0.3

shows alarm time hours over high threshold

7. LOW HR – 1.1

shows alarm time hours over low threshold

8. 14.9C

Push to return to current temperature

microDL Specifications
Temperature Sensor Thermistor
Measurement Intervals User programmable from 2 seconds to months, depending on memory. See Duration Chart for examples.
Power Source (2) 3 volt lithium coin cells. 10 year shelf life with approximately 3 years in continuous operating mode.
alarm Limits High and Low alarms set by temperature and time
Size Diameter: 2.86cm / 1.25in.
Height: 1.4cm / 0.5in.
Water Resistant Yes
Interface USB 1.1 Port Interface
CE Certified Yes
Waterproof Yes
MDAS-Pro Software
(Not 21CFR Part 11 compliant. Click here for 21CFR Part 11 Compliant Software)
Report Summary & Statistics  •File Manager  •Note Attachment  •Zoom  •Elapsed Time view or Date/Time Recorded view  •Celsius, Fahrenheit or Kelvin display  •3D view option
Options MDAS-Pro Software
Reader Station

Specifications subject to change without prior notice.

Model Number
SKU Number
EEPROM Memory 8k 32k 64k
Temperature Range: Low to High -30°C to +72°C
-22°F to +161°F
-40°C to +72°C
-22°F to +161°F
-40°C to +72°C
-22°F to +161°F
Temperature Accuracy: At zero
At Extremes
0.2°C / 0.4°F
0.5°C / 0.9°F
0.2°C / 0.4°F
0.5°C / 0.9°F
0.2°C / 0.4°F
0.5°C / 0.9°F
Stainless Steel Backs Yes Yes Yes
Variable Memory No No Yes
Continuous Memory No Yes Yes
Mean Kinetic Temperature Yes Yes Yes
Weight 17g / 0.6 oz 17g / 0.6 oz 17g / 0.6 oz
Warranty 12 months 12 months 24 months
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.

Stainless Steel Probe Standard Stainless Steel Probe (SSP) SKU#
Length 15.24 cm / 6 in. (custom lengths available)
Diameter 3.49 mm / 0.136 in.
Micro Probe Micro Stainless Steel Probe (MP) SKU#
Length 7.06 cm / 2.78 in. (custom lengths available)
Diameter 3.49 mm / 0.136 in.
Flat Flex Polyester Probe Flat Flex Probe (FP) SKU#
Length 61 cm / 24 in. (custom lengths available)
Width 0.76 cm / 0.3 in.
Detachable Flat Flex Probe Detachable Flat Flex Probe (RJ-11) SKU#8074
Length 66.04 cm / 26 in. (custom lengths available)
Width 0.76 cm / 0.3 in.
Flexible Teflon Probe Flexible Teflon Probe with Stainless Steel Tip (FTP) SKU#8105
Total Length 50.8 cm / 20 in. (custom lengths available)
Stainless Steel Tip 15.24 mm / 6 in.
Diameter 3.49 mm / 0.136 in.
microDL Reader Station microDL Reader Station SKU#8020
Interface SB, Version 1.1 Compliant
Height 24 mm / 0.96 in.
Diameter 44.84 mm / 1.76 in.
Cable length 81.3 cm / 32 in.
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