BWT Water Test Kit
This easy to use home or cafe test kit is an ideal way to verify your water hardness level prior to purchasing a water filter or use it as a random check that your current filter is performing correctly.
This is a simple chemical kit, just count the drops into the tumbler with a measured amount of water. Each drop counts as 20 ppm of hardness or 1 degree German hardness, count the drops until the sample turns colour.
Order wasn't delivered to my address, so I don't know.