Nothing exciting. Basically putting two equal weights on either side of the mattress, of course if there is a discrepancy in the mattress’s firmness one with obviously sink further then the other. They needed some kind of visual evidence.
Nothing exciting. Basically putting two equal weights on either side of the mattress, of course if there is a discrepancy in the mattress’s firmness one with obviously sink further then the other. They needed some kind of visual evidence.