I have one of these which is a fairly low cost way of checking:
https://www.axminstertools.com/thickness-gauge-0-15mm-210970?glCountry=GB&gclid=CjwKCAjwyaWZBhBGEiwACslQo0yUBOZoKbOiWgETCjH_M2Xw7t7cKc46LvQYc6FTkif0O6g7QZnIXBoCGlQQAvD_BwE
Great tool, I need one.
Also known as an Iwanson gauge, just for ease of googling.
@Triwack started
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I have one of these which is a fairly low cost way of checking:
https://www.axminstertools.com/thickness-gauge-0-15mm-210970?glCountry=GB&gclid=CjwKCAjwyaWZBhBGEiwACslQo0yUBOZoKbOiWgETCjH_M2Xw7t7cKc46LvQYc6FTkif0O6g7QZnIXBoCGlQQAvD_BwE