Fitting shafts up to 140 mm dia, digital Series EK600 measures rotational speeds up to 9,000 rpm with resolution of 225-3,000 cycles/rev. Magnetoresistive sensor tracks magnetic encoder wheel, outputting 2 incremental channels in quadrature plus once-per-revolution index marker. Channel frequency reaches maximum 500 kHz. Encoder withstands shock, vibration, oil, grease, salt spray, moisture, condensing humidity, and -40 to +115°C.