If you are going to buy a case gauge, consider a Sheridan.
http://www.sheridanengineering.com/index-1.htm
It does the body as well as headspace and case length. The Wilson is cut generous in the body. I have both and like both.
For just quick checking case length, a simple gauge will work. Some people make their own for whatever caliber it is.
https://www.midwayusa.com/product/559802/lyman-e-zee-case-length-gauge-ii
http://www.sheridanengineering.com/index-1.htm
It does the body as well as headspace and case length. The Wilson is cut generous in the body. I have both and like both.
For just quick checking case length, a simple gauge will work. Some people make their own for whatever caliber it is.
https://www.midwayusa.com/product/559802/lyman-e-zee-case-length-gauge-ii