Universal and special indicator papers • pH indicator papers have been on the market for decades and are the standard for many applications. • For each pH-value these papers show a single color which can be matched with the color scale at intervals of 0.2 –1 pH. • The characteristic features of pH indicator papers are: pH indicators are supplied in plastic reels that ensure long term stability and protection against many external influences.• The indicator paper will always be ready-to-use when needed. • a reel of 5 m length and 7 mm wide • minimum purchase: 5 reels