... by rotating button 3. 220V voltage Duodenary Direct Shear Pre-pressing ApparatusBrief Introduction :the model is specil model in china market ... efficinence when doing shear tests, you can do pre-pressing test before performing formal shear tests in lab Detailed Product ... Loading grade: 50, 100, 200, 300, 400Kpa4. Quantity of pre-pressing soil sample each time: 36PCS Feature: Stainless steel vessel and ...