• Usually ships in 3-5 business days



  • Automatically stores up to 16,000 readings (HD450)
  • Range: To 40,000Fc (400,000 Lux)
  • Built-in USB port
  • Cosine and color corrected measurements
  • Utilizes precision silicon photo diode & spectral response filter
  • Peak mode (10μS) captures highest reading
  • Min/Max and Data Hold

What's in the Box

  • Light sensor
  • Protective cover with 1m cable
  • Windows compatible software
  • USB cable
  • Built-in stand
  • Hard carrying case
  • 9V battery


The heavy duty Extech HD400 / HD450 light meter features a rugged design with an easy-to-read, large backlit display. The handheld Extech HD400 / HD450 light meter, weighing only 13.7 oz., has a wide range up to 40,000Fc (400,000Lux). The HD450 model also includes a data logging function, with the ability to automatically store up to 16,000 readings or manually accept/recall 99 readings.

The Extech HD400 / HD450 light meter utilizes a precision silicon photo diode and spectral response filter. A peak mode of 10µS allows the Extech HD400 / HD450 light meter to capture the highest reading. Other functions included are a min/max and data hold. The Extech HD400 / HD450 light meter also features a USB port allowing you to easily connect directly to your computer.


This product can be used in the following applications: