Hydrion Double Roll AB Dispenser, 1.0-11.0
By Micro Essential
A double roll pH paper dispenser measures pH from 1 to 11. One roll and chart covers the even pH range of 2, 4, 6, 8 and 10, while the other roll covers the odd range of 1, 3, 5, 7, 9 and 11. Papers show a distinct color change for each full pH unit. Each roll is 15' long x 7/32" wide, enough paper for over 200 tests.