Hydrion AM-40, Ammonia Test Paper, range : 0-100 PPM

Hydrion Ammonia Meter Test Paper is designed and calibrated to measure the amount of ammonia in air in parts per million wherever there may be actual or potential ammonia pollution. The color chart has matches at 0-5-10-20-50-100ppm.
each consisting of one(1) 15-foot roll of test paper, packed in a pocket-sized dispenser with specially calibrated color chart, and a polypropylene case. Provides for approximately 750-1000 tests.

Tear off a strip of paper, moisten with water and expose to the air. Wait 15 seconds and compare the test strip to the calibrated color chart. The color chart shows readings in ppm of ammonia in air.