At 10 mm thick x <37 mm dia, ECI 1118 absolute rotary encoder offers resolution of 18 bits, accuracy of ±120 in., and option for functional safety. Its counterpart, EBI 1135 model rotary encoder, offers same slim design and single-turn feedback as well as option for multi-turn capabilities. This is made possible via battery-buffered revolution counter that can attain distinguishable revolutions up to 16 bits with external battery connected. Both encoders have non-contact design.