Professional design, beautiful appearance generous, counts the frequency response is fast and powerful. Die-casting alloy shell, the surface electric pensu processing, dustproof wear-resisting, good shielding. Professional design, independent power supply, to adapt to the range, high stability, strong anti-jamming capability. Power supply and signal anti-interference ability, and durable panel of buttons, change is simple and convenient. Directly on the digital table for functional operation functions such as sine, cosine, tangent function, convenient