"Paper tester for measuring peroxide or sanosil in water (pool, whirlpool, well...) - 50 pcs of measurements
Dip the entire paper into the water under test for 5 seconds. Do not...
"Paperwork tester for measuring the hardness of pool water - 10 measurements
Dip the entire paper into the water being tested for 1-2 seconds. Wait 60 seconds. Compare with the...