Professional design, elegant appearance, fast and powerful digital frequency response. Die-cast alloy shell, surface electrospray treatment, dust-proof and wear-resistant, good shielding. Professional design, independent power supply, wide adaptability, high stability and strong anti-interference ability. The power supply and signal have strong anti-interference ability, the button panel is , and the replacement is simple and convenient. Perform function operations such as sine, cosine, and tangent directly on the digital table, which is convenient