BRUSH Surfindicator Model BL-110 Surface-finish (roughness) Measurement Instrument. Manual BRUSH Surfindicator Model BL-110 Surface-finish (roughness) Measurement Instrument. Manufacturers: Brush Brush Electronic Company Models: BL-110 BL-113 BL-130 BL-131 BL-132 BL-133 BL-134 BL-117 Contents: Operators Manual Electrical Diagrams