Typical Paper Charts vs. WaterColors
Most aquarists are familiar with well-known paper charts for comparing water test results, like this one from API.
WaterColors Is Different
The WaterColors Test Chart contains five separate charts in one download: Ammonia, Nitrites, Nitrates, Low pH, and High pH.
Each individual chart is a high quality jpg photo of actual test tubes.
The downloaded charts can be viewed on any device. Just zoom in to get a closer look at the colors.
Free WaterColors Test Chart
The WaterColors Test Chart is a downloadable file containing 5 separate jpg images of charts for measuring Low pH, High pH, Ammonia, Nitrites and Nitrates in your tank water. Currently, this group of files works with the API Freshwater Master Test Kit.