Simply insert the probe in the liquid to be measured, adjust the two controls on the front panel and read the dielectric constant from the display. The BI-870 can accurately measure in low and high dielectric solvents, including mixed liquids and solutions. The BI-870 Dielectric Constant Meter has two selectable sensitivity ranges: 1-20 and 1-200. Absolute accuracy is ± 2%, while repeatability and linearity accuracy is better than 0.2%. The measurement signal applied to the outer cylinder of the probe is a low-distortion sine wave at a frequency of 10 kHz..https://www.gaiascience.com.sg/productdetails/bi-870-dielectric-constant-meter