• Choose only the ranges you need, but keep the fine 0.2 to 0.4 pH unit resolution

These pH test paper booklets feature narrow pH unit graduation (0.2 to 0.4 pH) and can be used for severe pH measuring. Each leaflet is 1/4" x 2-3/4" (7 x 70-mm). There are 20 leaflets per booklet and 10 booklets per box.