by Gurley Precision Instruments is a High resolution incremental rotary encoder designed for industrial grade applications wherein it requires a superior resolution and accuracy. This model is available in two basic versions which consist of variation in mechanical configurations. All units have a standard specification of having an LED illumination which can last by about 100,000 hours. Also, its bearings are sealed for contamination resistance.. In addition, its sealing is protected with IP66 designed for harsh environment.