The PV tester is a key inspection tool in the photovoltaic industry chain, mainly used to evaluate the performance parameters and quality status of solar cells and modules. Its core functions cover current-voltage characteristic testing, power output analysis, defect detection, etc., achieving data acquisition and fault diagnosis through high-precision sensors and intelligent algorithms. Current mainstream equipment has integrated wireless transmission and AI analysis modules, which can quickly locate problems such as cell hidden cracks and hot spots, with detection efficiency more than 3 times higher than traditional methods. With the development of new photovoltaic technologies such as double-glass modules and perovskite, testers are evolving towards higher voltage (1500V+), multi-spectral detection and cloud collaborative analysis, becoming an indispensable professional equipment for power station operation and maintenance, production quality inspection and scientific research experiments.