I think the product is great and serves a purpose. The only thing "wrong" with it was its preceded hype to shake the ground of the industry. When you hype it to that level it will be a let down almost every time. But, it is still a very good and useful product.
It looks kinda like the scale on the hot sauce bottles... if it is really red its really potent... I'm fine with the sliding scale like that... Its a home test kit, nothing exact needed there.