What is the correct procedure for measuring and checking manual transmission clutch plates (friction discs and steel plates) for wear?

1. Measure friction disc thickness with a micrometer, and check steel plates for warpage using a thickness gauge on a precision surface plate.
2. Scrape the plates with a steel brush and check if they are shiny.
3. Measure the outer diameter of the plates using a sewing tape measure.
4. Measure the weight of each plate on a digital scale and check if it is within 5 grams of the brand-new specification.