Features： (1) Horizontal arrangement corresponds to the operation flow design of the PC boards for handy operation. (2) Board body uses high class POM material to avoid static interference and is also able to withstand high frequency. (3) The insertion round holes can stand continuous wear and tear without easily deforming. (4) Spring contact uses phosphor bronze (with high elasticity and highly conductive), can stand operation more than 10,000 times. (5) Comfortable color to help operator for longer time and to avoid eye fatigue. Exquisitely printed coordinates for easy recognition and calculation. (6) Using durable base stand aluminum plate to stand high frequency and low static.