Unknown clamping forces in the installation of computer chips and heat sinks will cause great product defects and quality problems, reduce output and product qualification rate, and increase costs. PF pressure film is a key diagnostic and equipment installation tool for clamping and fixing. The ultra-thin color-indicating film (0.1mm) can be placed between any two contact surfaces, such as a radiator and a heat source, to show the pressure distribution between the clamping fixture and the bearing surface.