Scope The instrument can precisely control the sample temperature, it can accurately measure the surface tension of various liquids and mineral oil against water by astm d971 ring method. Features 1, lcd display, keyboard operation 2, single-chip program control, automatic detection 3, automatic calibration procedures and calibration weights, easy to operate 4, integrated design, easy maintenance Technical parameters 1, the display method: lcd display 2. Measuring method: ring method 3, measuring range: 5 ~ 95mn / m 4, the moving speed: fast: 1mm / s 5, slow speed: 0.3-0.4mm / s 6, sensitivity threshold: 0.1mn / m 7, accuracy: ± 0.5mn / m 8, the power supply voltage: 220v ± 10%, 50hz ± 5%