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.
- 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