DD7 Digital Differential Refractometer measures solutions of low concentration (up to 2%) with an extremely high accuracy level of ±0.005%. It is recommended for samples such as unsweetened tea and surfactants. Two types of solutions (distilled water as the standard solution, and the sample liquid to be measured) are injected into the instrument with syringes. In addition, solutions of higher concentration can also be measured by using a standard solution other than distilled water.
