H2S vial (Bacteriological ) Kit use for checking microbiological quality of water. Water borne diseases like typhoid ,cholera, diarrhoea and jaundice and caused by polluted water supply. The conventional method for testing the microbiological quality of water needs the service of a qualified microbiologist , laboratory facilities and take 60 – 72 hours to know the result. And further the laboratory may charge any amount per sample for the test. The new devloped screening test , done at field itself, dispenses with all these problems and will cost & timing much less.