Ammonia test paper (AM-40) 0-100 ppm. กระดาษวัดค่าแอมโมเนีย Hydrion
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.