The double ended pin gauge is a simple tool to check if the orifice disc is worn out or not. Each gauge has a GO and a NO-GO side with a 0.02 tolerance. The GO side should fit in the orifice disc, the NO-GO side should not. If the NO-GO side fits, the orifice disc has worn out and needs to be replaced.
For every hole size of the orifice disc, a double ended pin gauge is available. They can be ordered individually and do not need to be purchased in a set of multiple sizes. When ordering the product, please make sure to pick the exact size, even a difference of 0.02 mm will have a negative influence on your spray drying process.