https://www.himedialabs.com/us/lab-chemicals-and-biochemicals/testing-kits/aquacheck-water-testing-kit.html
AQUACheck Water Testing Kit - Testing Kits - Lab Chemicals and BioChemicals
water testing kitlab chemicalskitsbiochemicals
https://www.usgs.gov/media/images/water-testing-ph-analysis-kit
Water Testing PH Analysis Kit | U.S. Geological Survey
Manufactured by Lamotte Chemical Products Company, Chestertown, Maryland sometime after 1930. Object ID: USGS-000249
water testingph analysisgeological survey