ProScale Model 250 is an absolute encoder with stock measuring ranges of 2, 4, 5, 8, 10, 15, and 20 feet. 5 different digital readouts are available for Model 250.
Maximum slew rate is 16 inches per second.

ProScale Model 280 is an inductive incremental encoder with stock measuring ranges of 2, 5, 8, 10, 15, and 20 feet. 4 different digital readouts are available for Model 280.
Maximum slew rate is 60 inches per second.

ProScale Model 380 is an inductive incremental encoder with stock measuring ranges of 2, 5, 8, and 10 feet. 4 different digital readouts are available for Model 380.
Maximum slew rate is 60 inches per second.

ProScale Model 580 is an inductive incremental encoder with and integrated linear bearing and sliding carriage. Stock measuring ranges of 4, 8, 12, and 16 feet. It can be supplied with or without a digital readout.
Maximum slew rate is 60 inches per second.

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