... 5. stable package Item Name:pH Test ReagentHow To UseDrop three globelets into water, then the paper ... testing,low price, new type,easy to operate,convenient to carry Target: effective to any colorless alkaline solution whose ph ... a bottle Instrucion: drop 3-4 the reagent to 50ml tested solution and shake,or drop 1-2 ... the color on the card ,then we can get the related ph value. Storage period:3 years ...