The CHC-I contains internal RS232 computer interface, the calibration is done by software. It is suitable for monitoring and remote applications. The CHC-I software can calibrate the instrumentation, sample the data through RS232 interface and print out the results. It can also be calibrated by other standard light sources to obtain very high measuring accuracy of x, y color coordinate and color temperature. It is a real-time measuring system and run under Windows System. 128*64 lattice LCD display, RS232 computer interface and software, Data hold function.