I am thinking of buying the LaMotte pH test kit. I noticed that That Fish Place has the kit that measures from 6.0 to 7.4 in 0.2 increments. Pet Warehouse has a kit that measures from 5.0 to 8.5 in increments of 0.5. Are they really two different kits? The LaMotte web site only lists the 5.0 to 8.5 kit. Thanks Sherlock Wong