Temperature/Relative Humidity Data Logger with Graphic LCD Screen

Product Code: HDT-GFX-2

The HDT-GFX-2 standalone USB data logger measures and stores up to 252,928 temperature and humidity readings over a -30°C to +80°C (-22°F to +176°F) and 0 to 100%RH range at a resolution of 0.1°C and 0.1%RH. Using the free EasyLog USB software (available for download using the link below) users can quickly set up the data logger and view downloaded data by connecting the device to the PC’s USB port using the supplied cable.

The data logger features a high-contrast graphic LCD and three-input buttons. This allows users to start, stop and restart the data logger using on-screen menus. This menu also provides real-time analysis of data either as a data summary (showing highest & lowest readings and alarm conditions) or as a graph that updates as new data is added. The Max and Min readings and also the Time and Date these are valid from, can be displayed on the LCD ( info button). If desired, the user can then reset the Max/Min shown on this screen of the LCD. Each time these maxima and minima are reset whilst logging, an "Event Marker" is created in the data. When the data has been downloaded to a PC these Events can be viewed on the graph (Mark Events), they also appear in the data file - associated with the corresponding log when the reset took place. For certain applications where procedures mandate that a regular physical check of the logger / stats have taken place – this can be useful as an audit / validation tool. Multiple data logging sessions can be stored on the device ready for upload to a PC at a later date.

The data logger’s robust design provides IP-67 waterproof protection and the two replaceable ½ AA batteries typically allow logging for up to one year.

The unit is supplied with a wall-mounting clip which also features two mounting holes and a magnet for quickly mounting the unit on a metallic surface.

Lascar Product Code: EL-GFX-2

  • Features
  • Technical
  • Documents
  • Software
    • Rugged and robust IP67 construction
    • -30°C to +80°C and 0 to 100 %RH measurement ranges
    • Logging rates between 10 seconds and 1 hour
    • Stores over 250,000 readings
    • On screen menu and graphing to start, stop, review and restart the logger in the field
    • Micro USB interface for PC based set-up and data download
    • Easy setup using free EasyLog USB PC software
    • User-programmable alarm thresholds
    • Immediate, delayed, push-button or temperature/RH triggered start mode
    • Graphic LCD shows real-time readings, graph and current status
    • Resettable Min/Max readings may be viewed on the LCD
    • User set audible alarm
    • Highly visible confidence/alarm LEDs
    • Supplied with user replaceable ½ AA batteries
    • Supplied with a wall-mounting clip and magnet for metallic surfaces
  • Technical Details
    Temperature Measurement Range -30°C to +80°C (-22°F to +176°F)
    Internal Resolution 0.1°C (0.1°F)
    Accuracy (overall error) ±0.35°C (±0.59°F) typical (5 to 60°C)
    Long Term Stability < 0.02°C (0.04°F) / year
    Relative Humidity Measurement Range 0 to 100 %RH
    Internal Resolution ±0.1%RH
    Accuracy (overall error) ±2.05%RH typical (20 to 80%RH) 1
    Long Term Stability < 0.25%RH / year
    Dew Point Accuracy (overall error) ±1.4°C typical (-30 to 80°C, 40 to 100%RH) 2
    Measurement Unit  °C, °F, %RH 
    Logging Rate User selectable between 10 seconds and 1 hour
    Operating Temperature Range 3 -30°C to +80°C (-22°F to +176°F)
    Battery 2 x 3.6V ½ AA lithium battery (replaceable)
    Battery Life 4 4 months Typical
    Dimensions 88mm (H) x 48.5mm (W) x 30.5mm (D)


    1 This specifies the overall error in the logged readings, for relative humidity measurements between 20 and 80%RH.

    2 This specifies the overall error in the calculated dew point for relative humidity measurements between 40 and 100%RH at 25°C.

    3 At temperatures below -5°C the LCD will exhibit slower response times. The LCD will be disabled at temperatures under -20°C and above +70°C.

    4 At +25°C and 10 minute logging rate, with no alarm LEDs or sounder and minimal LCD use.

  • Free EasyLog USB software

    Free EasyLog USB software

    The core of Lascar's USB data logging solution is the free software supplied with each USB data logger. Using a wizard format to guide the user through setup of the data logger and subsequent download of collected data, the software puts the 'easy' into EasyLog.

    Compatible with 32-bit and 64-bit versions of Microsoft Windows 7, 8 and 10

Note: supplied product colour may vary from image shown