Universal indicator paper pH 1-10 - is a compound solution or a mixture transfused with a number of pH indicators to detect alkalinity or acidity of various solutions. The detection is accomplished through simple, smooth changes in colors when reacting with indicator paper operating with a pH value range of 1 to 14.
U 1235 (OTTO) Universal indicator paper refill pH 1-10 {without colour scale (box of 6 refill)} - used to broadly test whether a solution is acidic or basic and comes in 3 types - red, blue, and neutral.