Encardio-rite model EDJ-40TJ triaxial crack/joint meter is used for surface measurement. Surface crack/joint measurements can be made either on the surface or at locations accessible from galleries (in case of dam).
 
EDJ-40TJ triaxial crack/joint meter for surface measurement consists of two precision machined elements attached to reinforce bar anchor stems. The precision elements are made of aluminum and are epoxy painted to make it corrosion proof. The micrometer rest blocks and mounting buttons are of stainless steel.