So, if I get the 6.5, I can tell what my
lamps are doing, but I need the 7.0 to help decide how long a person can tan in any given bed, depending on his/her skin type, right? If I had to choose only one of these 2 meters, which one does the best job at the other one's specialty? That is, I need to get both, but can only afford one, right now. Thank you.