Field Inspection Pocket Vane Tester

This tester, designed to measure the undrained shear strength (CU) of cohesive soils, consists of a cylindrical body with a torsional spring and three interchangeable vanes of different sizes used depending upon the expected strength of the soil. The vanes have the following dimensions:
- small size 32x16 mm (height x dia.)
- medium size 40x20 mm (height x dia.)
- large size 50.8x25.4 mm (height x dia.)
The heightdiameter ratio of all vanes is 2. During operation the vane is driven for 5-6 cm into the soil and then turned with the handle. Deep measures (i.e. on the top of undisturbed samples) can be obtained using the extension rod