Ключевые слова: adult, analyzing, base, black, cell phone, chart, closeup, colors, comparison, concentration, examining, female, human hand, indicatorpaper, laboratory equipment, liquid, measuring, medical exam, medical sample, medical test, medicine, mobile phone, one person, people, ph, reagentpaper, reagents, research, smart phone, square, technician, technology, test strip, testpaper, urine, women, young adult,