Instruct: Classify a given review into positive or negative sentiment.
Query: An upper arm BP device.

This type of BP meter (upper arm meter) was recommended by my doctor to be the most accurate one. So I bought a new HEM-780 BP meter from Amazon and to check the doctor's statement I brought my new HEM-780 BP meter to doctor's office checking my BP parallel to his checking with his professional mercury BP meter device. The readings were very close and I was pleased to have found a reliable BP meter finally.