The Biceri Bore Polish Scanner is a precision optical instrument for measuring polish in an engine cylinder bore. It was initially designed for the Daimler Benz OM364A engine (CEC L-42-T-89), however it could effectively be used for any engine. A low power (0.5mW) eye-safe, helium-neon laser is used to scan the engine cylinder measuring the reflectivity of the bore surface.

To ensure correct alignment of the scanner tube, the borescanner is designed with two base plates. The scanner assembly is mounted on the upper plate, while the lower plate, which will be specific to each engine type, is located on dowel pins situated appropriate to the original machine of the engine block. The two plates are finally connected together using locating dowels.

A precision optical system of mirrors, beam splitters, and polarising optics directs the light beam onto the cylinder wall and light reflected back along the same path.

The scanner tube is lowered and rotated into the cylinder, measuring every 0.039 square inches (1 square mm). The position and movement of the measuring tube is controlled by two stepper motors, which are in turn controlled by an IBM compatible PC. The calibration routine is carried out automatically before a series of measurements is started.