A digital meter that tells you the barometric pressure in inches of mercury and the boiling point of water in degrees of Fahrenheit based on the barometric pressure at that time. It will also tell you what the finish temperature of syrup is. A great tool for someone that wants to know the precises boiling point at their location on any given day. A must have for someone who travels and makes candy or cream at different locations. It has a USB cord to plug into a computer, portable battery pack or phone charger.