This is a Taylor Drop Test Sodium Chloride (Salt Water) (Large 2 Oz.) Test Kit (1 drop = 200 or 800 ppm). K-1771 tests for Chloride in Salt Water pools using drop test and Argentometric reagent.
If your pool is using salt water for sanitization, this test is important for you. The ideal salt level for pools is between 2700-3400 ppm (parts per million) with 3200 ppm being optimal.