GenIII image intensifiers have been in use for decades and have undergone continuous improvements in terms of performance. Delicate matching of each individual tube with customized power supply remains workforce intensive and is one of bottlenecks in mass production. With each individual intensifier module having distinctive characteristics, achieving standardized performance in serial production is accomplished by compensating for tube individuality with programmable power supply unit. Since power supply and tube must be enclosed in a sealed package, matching is a one-time operation. For a power supply unit to be capable of matching tube variations in production, it must be capable of wide range of adjustments in polarization voltages. Thus, each power supply must be individually qualified on a dedicated test bench and must satisfy strict requirements for wide adjustment ranges. This paper presents a dedicated, custom made, test bench and its operations for testing power supplies in mass production and qualifying them for tube matching.