Electroacoustic comprehensive tester CRY6151、CRY6151B、SOUNDCHECK、CLIO、LMS、DASS etc.SUNLILAB AUDIO SWEEPER 7116C、 Loudspeaker Polarity Tester139B、NOISE GENERATOR 8121C、THE WEIGHTING FILTER8121FT-1, GAUSS METER 138A、IMPEDANCE METER 152A、DIGITAL HIGH-SPEED Fo METER 7117 C.