The Hydrion Ammonia Test Paper is designed and calibrated to measure the amount of ammonia in the air. These strips can be used to detect trace amounts of ammonia in poultry houses or animal barns, where levels as low as 25 ppm can be harmful. Also helps to identify contamination from processing equipment.
 
Each kit contains one roll of paper in a protective plastic dispenser with a matching color chart. To use simply tear off a strip of paper, moisten and expose to air - wait 15 seconds and then compare to the calibrated color chart.