Portable tool for waveform measurement. It is one of the best test tool for use in teaching field. It uses a high speed AD sampler to convert the input analog signal into digital signal and displays the signal on a 128 x 64 LCD after processing the signal through a high-speed CPU. It uses a high speed comparator to get a good edge trigger for a steady display, which is good for observation. Its multimeter part uses a dedicated, 6000-count chip, which can provide a higher precision data. Power supplied by 1 piece 3.7V lithium battery.(Battery included in the equipment)