Hongkong and Shanghai Total Co., Ltd. is producing oscilloscope, handheld digital storage oscilloscope, portable digital storage oscilloscope, oscillometer, digital oscillometer, signal generator, function generator, function signal generator, DDS function generator, digital direct composite function generator, frequency counter, intelligent frequency counter,digital frequency counter, bench top multimeter, bench-top multimeter, Bench-Type Digital Multimeter, bench top DMM, bench-top DMM, bench DMM, true RMS Bench Digital Multimeter, spectrum analyzer, semiconductor curve tracer, stabilizer, voltage stabilizer, DC power supply, switching power supply.