Micro Essential Laboratory Insta-Chek pH Pencil 0-13 Mechan 3/pk - P-12M

Micro Essential Lab - The Hydrion insta-Chek Mechanical pH Pencil measures surface pH of any solid to the nearest pH unit. Each package contains 3 mechanical pencils and 3 color charts. Each pencil will give the user at least 100 tests. Replaces Hydrion I