Duo indicator papers show two different colours for each pH value.
Easy to use for qualitatively accurate readings
Produced from high quality paper to give good colour matching of paper to printed calibration scale
Narrow range papers with graduation intervals of 0.3 pH units on the colour scale
Wide range papers with graduation intervals up to 1 pH unit on the colour scale
Delivery information: Supplied in plastic reels that ensure protection and long-term stability. Reel of 5 m length, width: 10 mm