pH Testing Pen

$11.00

Description

The pH testing pen provides a quick and easy method for testing the acidity of paper.

Simply draw a line and watch the colour as it dries. The chlorophenol red will turn purple/lavender as it dries if the paper is acid-free or neutral pH, while yellow or colourless indicates acidity.

Additional information

Weight0.04 kg
Dimensions20 x 6 x 2 cm