Incremental Shaft Encoders of Torque 10 gm cm use [normally infra red] emitter - detector pair to create a light source, which passes through a disc made of transparent and opaque windows on its periphery. Tachometric Controls offers Incremental Shaft Encoders of Torque 10 gm cm. Tachometric Controls is an ISO 9001: 2000 certified company that manufactures Brushless DC Motors [BLDC Motors], AC Induction Motors [& Geared Motors]: up to 5 HP, DC FHP PMDC Motors [& Geared motors]: up to 1HP, etc. Incremental Shaft Encoders of Torque 10 gm cm is normally divided into Absolute Encoders: An encoder, which shows absolute [encoded] position of the load and Incremental encoders: this gives proportional output on increment of position of the load.