Any residue on our fingers can cause erratic readings, from hand cream to food particles, from alcohol (from wipes) to sweat and water. That's why we should always wash our hands in soap and water, then rinse and dry well before testing.
ThanksAny residue on our fingers can cause erratic readings, from hand cream to food particles, from alcohol (from wipes) to sweat and water. That's why we should always wash our hands in soap and water, then rinse and dry well before testing.