The Yeasn HX-400 is a mechanical pupilometer (PD meter) which means quick and continuous measurement is possible with accurate alignment. There is an in-built high-accuracy linear sensor which enables the smart electronic system to visualise accurate readings.

HX-400 Features:

  • LED light source with adjustable brightness, auto shut-down time and adjustable step
  • VD measurement function
  • Low power consumption
  • Available for +2.00D visibility compensation
  • Self calibration function