How to test water quality?Tests for limited budgets.

Typical low-tech, portable, field test methods for chemical water quality monitoring fall into three categories:
--Test strips.
--Color disk kits.
--Hand-held digital instruments.
Test strips are the most convenient and ready-to-use method.
Need to check those indicators?
UNICEF recommends prioritizing fluoride, arsenic, and nitrate for chemical monitoring.:
--Fluoride
--Arsenic
--Nitrate
Resources permitting:
--Iron and Manganese
--TDS
--PH
--Chlorine
Other:
--chloride
--heavy metals
--alkalinity or hardness
--Test formats
Typical low-tech, portable, field test methods for chemical water quality monitoring fall into three categories:
(1)Color disk kits
(2)Hand-held digital instruments
(3)Test strips
Water quality test paper, how to use it:
1: Put the test paper into the water for 2 seconds;
2: Hold in the air for about 15 seconds;
3: Compare the test strip with the map, which needs to be done within 60 seconds;
The test is carried out at room temperature around 25°C.