keaiduoa 100 Strips 0-14 PH Alkaline Acid Indicator Paper Water Saliva Litmus Testing Kit

Usage: test liquid ready, take out a test paper, the 2 color blocks all immersed in the liquid, after 1 seconds to take out, in contrast to the color of the color reading value in 30 seconds 0 - 3 indicates a very acidic substance 4 - 6 indicates an acidic substance 7 indicates neutral 8 - 11 indicates alkalinity 12 - 14 indicates a very high level of alkalinity Plastic Box Size: 6.7x8.7x1.1cm Quantity: 1 Set/100 Strips Tips: Can not indicate the Acid or alkali solution when its density was lower than 0.01%. Keep dry for the rest paper Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Contents:  1 Set x PH Test Paper 1 x Plastic Box