I once spent the summer working at a gas station. The fuel is stored in big underground tanks. Every day we took this really long fiberglass pole and poked it down into the underground tank. The pole had inch markings like on your measuring device. Like a really long dip stick, we would lift out the stick, find the top of the wet area, mark down the depth measurement, and then later refer to a chart that told how many gallons of fuel were left in the tank.Wonder if that relates to your device Teo?
He said the wooden ones that I remember are carpenter's rulers.The one in the OP would probably be used for concrete/cement or some kind of bricklaying but he wasn't sure. The coarse measurements and non-sequential incrementation were something he hadn't seen before. He said he would ask around and let me know what else he found out.Interesting.