The CP is a standpipe piezometer used to measure pore water pressure and water level in permeable soils within geotechnical applications such as slope stability, dam performance and embankments. It also measures effectiveness of ground improvement techniques, effect of construction on surrounding structures, drawdown due to dewatering and pump tests, as well as seepage through earth structures. 
 

Datasheet: 

CP1&CP15-E5006A-W.pdf

Manual: 

E1006A-060220.pdf