Neiko 01407A Electronic Digital Caliper

What is this?

Digital calipers, a tool used for accurate measurements down to 0.01mm

Why did I buy it?

After I started getting into 3D design for 3D printing I needed a way to accurately measure all the objects that I was making things for. I had never heard of or used calipers before this, but MAN is this a useful tool! 

While I primarily use this in conjunction with my digital designs, I have used it to measure screws to find out their sizes and similar situations when accurate measurements were needed. If you make anything - you need digital calipers. Cheap too!