The Rigchina Mud Balance provides a simple, practical method for the accurate determination of fluid density. The durable construction of the Rigchina Mud Balance makes it ideal for field use. Despite its sensitivity, it contains no easily broken parts. Principally, the balance consists of a base and graduated arm with cup, lid, knife-edge, rider, built-in spirit level, and a counterweight. A plastic carrying case is provided to hold the balance intact and in its working position.