These are the instruments a first aid room, a school office or an occupational health clinic uses every day: blood pressure monitors, thermometers, pulse oximeters, stethoscopes, pen torches and diagnostic tests.

A pen torch is on the HSA list of recommended first aid kit contents, and the rest of the range is chosen for people who check the same readings often. Each product page states what the device measures and how it is powered.

Follow the manufacturer's instructions for use, cleaning and any calibration. The instructions for each device are on its product page where the manufacturer publishes them.