EXTECH SDL400 Light Meter Datalogger

The EXTECH SDL400 Light Meter Datalogger records data on an SD card in Excel format. Wide range to 10,000 Fc or 100kLux. Cosine and color-corrected measurements.

(1 customer review)

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EXTECH SDL400 Light Meter Datalogger

The EXTECH SDL400 Light Metre Datalogger is a professional-grade device that records data in Excel format on an SD card. It has a measurement range of up to 10,000Fc or 100kLux and ensures accuracy through cosine and color correction. The SDL400 employs a spectral response filter and a precision silicon photodiode.

This device also has an offset adjustment for the zero function to permit relative measurements, as well as customizable data sampling rates. It can manually save up to 99 measurements and has an astonishing capacity of up to 20 million readings with a 2GB SD card. It has a Type K/J Thermocouple input for high-temperature measurements.

The SDL400 has a big backlit LCD display for simple data viewing. It also includes useful functions like as minimum and maximum value recording and recall, data hold, and auto power-off.

EXTECH SDL400 Light Meter Datalogger specifications

  • Fc Range 200, 2000, 10kFc
  • Lux Range 2000, 20k, 100kLux
  • Max. Resolution 0.1Fc/1Lux
  • Basic Accuracy ±4%rdg
  • Temperature (Type J/K) J: -148 to 2192°F (-100 to 1200°C) K: -148 to 2372°F (-100 to 1300°C)
  • Cosine & Color Corrected Yes
  • Storage SD Card
  • Datalogging Manual: 99 readings Continuous: Datalogs with 4GB SD card
  • Dimensions/ Weight 7.2×2.9×1.9″ (182X73X48mm)/16.8oz (475g)
1 review

1 review for EXTECH SDL400 Light Meter Datalogger

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  1. Frances

    For the price, works great.

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EXTECH meters and testers help you ensure uptime, maximize productivity and verify compliance. Whether used as a component of an effective predictive maintenance program or as a key tool for a rapid response repair team, EXTECH instruments are the meters of choice for professionals who need to solve problems. Extech continues to build brand loyalty and trust among electrical contractors, industrial mechanics, facilities maintenance, HVAC/R technicians, sustainability & safety directors, public works managers, building & restoration contractors, and more. Extech products are backed with a standard full 2-year warranty, and select products up to 3 years, against defects.


Data Sheet


Lux meter
illuminance range(Lux) range/resolution/accuracy

2000, 20k, 100kLux / 1Lux/±4% of reading

illuminance range(FC) range/resolution/accuracy

200, 2000, 10kFc/ 0.1Fc/ ±4% of reading

Mechanical and General Specifications

182 × 73 × 48mm




6 × AA (1.5V) batteries