Extech Light Meter Data Logger – SDL400

In stock
This light meter has a wide measurement range up to 100kLux or 10kFc. This is great for even direct sunlight. With a data logging function saving data in Excel format for download to a PC.

Extech Light Meter Data Logger – SDL400

Data logger date/time stamps and records readings on an SD card in Excel formatSDL400data-s


  • Wide measurement range up to 10,000Fc/100kLux
  • Cosine and color-corrected measurements
  • Utilizes precision photo diode and spectral response filter
  • Selectable data sampling rate of 1 to 3600 seconds (1 hour)
  • Manually store/recall up to 99 readings and 20M readings with 2G SD card
  • Large backlit LCD
  • Type K/J Thermocouple input
  • Min/Max and Data Hold
  • “ZERO” re-calibration
  • Auto power off with disable function
  • Data logger date/time stamps and stores readings on an SD card in Excel® format for easy transfer to a PC
  • Offset adjustment used for zero function to make relative measurements
  • Comes complete with:
    • 6 AA batteries
    • SD Card
    • Hard case
    • Light sensor with protective cover
  • 3 year warranty

A Foot Candle/Lux Meter simply measures the intensity of light as perceived by the human eye. One lux is the equivalent of the amount of light by a full moon on a cloudless night, where direct sunlight is over 32,000 lux. One Foot-Candle, on the other hand, is about the same amount of light as is produced a foot away from a candle; two simple scales to measure the same thing-light intensity.

Light intensity is typically measured in office buildings, photography studios, schools, computer labs and anywhere that motion pictures are being recorded. Light intensity is very important for the proper development of pictures and film and it can even change people’s moods. Workers prefer a well-lit environment and work more efficiently if they aren’t straining their eyes to see a computer screen due to dim light.

This meter saves light intensity readings straight to an SD card for simple and quick transfer of data to a PC. The readings are saved in Excel format for immediate use in an Excel spreadsheet or graph. Featuring a large measurement range up to 100kLux or 10kFc for measuring even in direct sunlight.

This is the culmination of years of light meter development, combining data logging abilities with a large measurement range and a rugged, easy to use meter. This meter also features the ability to measure temperature with a Type K or Type J thermocouple probe (not included). The SDL400 Light Meter Data Logger User Manual is attached to this page to answer any additional questions.


  • Fc Range: 200, 2000, 10kFc
  • Fc Resolution: 0.1Fc
  • Lux Range: 2000, 20k, 100kLux
  • Lux Resolution: 1Lux
  • Type K Temperature: -148 to 2372°F (-100 to 1300°C)
  • Type J Temperature: -148 to 2192°F (-100 to 1200°C)
  • Memory: 20M data records using 2G SD card
  • Dimensions: 7.2 x 2.9 x 1.9" (182 x 73 x 47.5mm)
  • Weight: 16.2oz (475g)

Unit Ship Weight: 1.5 lbs

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