Duplex head evaporation chaining pin

The utility model provides a duplex head evaporation chaining pin, including scale, spout and base, the spout cover locate the outside of scale and with scale sliding connection, the base cover locate the outside of spout and with spout sliding connection, the scale is equipped with the main scale scale, and the base is equipped with trip scale label, and the main scale scale is the corresponding and graduation 0.1mm that differs with trip scale label, the side of base is equipped with normal speed adjusting festival knob, and gear hole that the gear of normal speed adjusting festival knob one end passes through the base back meshes with the tooth's socket at the spout back mutually, the spout upper end is equipped with slow speed adjusting festival knob, and slow speed adjusting festival knob passes through the screw rod and fixes the upper end at the scale, the lower extreme of scale is fixed with and triggers the head of contact pin in advance that line and sounder be connected and trigger the measurement