Research in the Department of Precision Instrument is divided to four main parts, led by its four research institutes: the Institute of Opto-electronic Engineering, the Institute of Instrument Science and Technology, the Engineering Research Center for Navigation Technology, and the Center for Photonics and Electronics. At the same time, the Department of Precision Instrument has three key laboratories: the State Key Laboratory of Tribology, the State Key Laboratory of Precision Measurement Technology and Instruments, and the Key Laboratory of High-accuracy Inertial Instrument and System. It also has two national engineering research centers, which are the National Engineering Research Center of Optical Disk and the CIMS National Engineering Research Center.