I was looking into that a long time ago before getting my durometer and I found that the sensitivity for the use of rubber and the use of FOAM which is our intended purpose are actually different. It has something to do with density of mass. I thought it would suit my purpose but it would have only been a costly lesson so I picked up the right one and to be honest I dont even use it all that much after buying it. You could get away with not owning one at all and be just fine, mark and match the tires before and after use.
"Failure Is Not An Option"