Main Features ?4.3 inch color LCD screen with friendly UI makes operations easy. ?Big storage space and support USB storage and data transfer to USB drive. ?There are three standard piecewise curves in the system. Customers can create up to 200 piecewise curves subject to different concentrations which will literally improve measurement precision. ?Adopt ARM9 main control chip which makes operations easy and smooth, instrument respond quickly. ?USB and RS232 port for data transfer and printer connection. ?Adopt special and high precision light filter system to ensure the instrument's stability and measurement precision. ?Cold light source, narrowband interference, with long lifetime up to 100,000 hours.