Danchell-type water testing kit, England, 1867-1904
1867-1904
Water testing kit, England, 1920-1940
1920-1940
"Afloc" water test kit, type MHP
Paper sensors to detect COVID-19 in wastewater
2020-2021
Oxfam/Del Agua water testing kit, 1984-1986
1984-1986
Early field version of the Oxfam/Del Agua Water Testing Kit
