In this video, we show you how to use surface tensiometer model A101 which is a multi function machine that can be used as surface tensiomteer, balance and density balance. So, it can weigh the weight, measure density of solid and liquid and measure surface tension or interface tension between oil-water system. In the video, we show how to measure surface tension (what condition say you haven't cleaned you system correctly) and how to change your tensiometer to balance or density balance quickly. Visit http://www.usakino.com to find more information about our force surface tensiometer or optical contact angle meter (contact angle goniometer)