... Refractometer, PH/DDS/TDS Meter, etc. Characteristics: ² Portable, mini type, light and handy. Intelligent design, easy to operate, convient to use ... long lifetime light source without change, ² LCD display. Accurate, and repeating very well. ² Ringing tips during operation. Undervoltage Alarm. ... 20°,45°,60°,75,°angle as per clients demands. Portable Gloss Meter(Portable, mini type, light and handy)