Something I've mentioned in passing before in articles is how important it is for an installer to take good care of any surveying equipment: a surveying rod, hand level, transit or tripod level.
I often see equipment bouncing around in the back of pickups or left exposed in truck cabs to extremes in heat and cold. These conditions are harmful to sensitive instruments. There is a way to check whether the line of sight of a surveying instrument is parallel to the axis of the bubble tube on the instrument so when the bubble is centered and the instrument is level, the axis
