It is very convenient to check the slope of the drain piping. What I need is primarily 1/50/1/100/1/150, but you can understand the gradient simply by placing it on a pipe like a normal leveling device.
It is compact and can be useful with high accuracy. The price is not a neck in consideration of long use at about 2000 yen ◎ that there are many types of gradients. However, since it is recommended that a long gradient meter of about 60 cm is recommended for the slope of the unusual dirt, it is purchased separately and used properly.