This is useful for everyone who has hobbies and is involved in DIY. You can measure screws, buttons, electronic sizes, springs, everything in 3D printing, etc. with an accuracy of 1/10mm. This particular caliper - vernier has its own storage case but needs lubrication to be used, such as silicone grease or something similar, that won't stain your hand during use. It seems durable, it wasn't manufactured correctly but it does its job.