From Instruments Direct, a pack of individual hardness test strips designed for measuring the calcium and magnesium mineral levels in the water. The water hardness test strips are made from a thin plastic material and a tip treated with a chemical that changes colour when immersed in water. These testing strips are easy to use and provide accurate results within 10 seconds.
• Take a single testing strip and hold the test end under in a sample or a stream of running water
• Remove the strip from the sample or running water and carefully shake off any excess liquid.
• Expose the indicator tip to the air and wait for a few seconds for it to change colour
• Compare the test tip with the supplied colour chart.
• The full range scale 0, 50, 125, 250 and 500 ppm (soft – hard- very hard)