MODEL:unfold,5folds A graduated square or round straight or jointed folding brass rod with attached ring; used for measuring the depth of liquid contained in a space. When ordering, specify the shape of the rod, the length, and the number of folds.How to order: CODE Sounding rod, NUMBER of FOLDING, SHAPE of ROD, LENGTH, GRADUATION Unit Per Pc CODENo. of foldingShape of RodLengthGraduation37 03 ...