What is the thumbnail test? return to 1k with straight SR and after how do you rate the bevel?I love the thumbnail test. To find out what you are looking for, just take a shave ready razor to the 1k. You know the shave ready razor will have its bevel set, so do 25 or so laps to bring the edge down to a 1k edge. Then give it the thumbnail test to see how that edge feels. I always hope a bit more on the 1k after the test to repair any small damage.