Description
Model A: Clock drawing board portable box
Model B: Metrological Observatory Drawing Board Handheld Box
Model C: Traffic drawing board portable circuit box (requires 2 AAA batteries)
Model D: Handheld circuit board for traffic meteorological station (requires 2 AAA batteries)
Model B: Metrological Observatory Drawing Board Handheld Box
Model C: Traffic drawing board portable circuit box (requires 2 AAA batteries)
Model D: Handheld circuit board for traffic meteorological station (requires 2 AAA batteries)



















