A Brookstone Petersboro New Hampshire maximum registering pocket thermometer, measuring 13 inches in length. Constructed with a glass thermometer tube housed in a nickel-plated brass or metal case, the front is slotted for easy temperature reading. Features a suspension ring for portability. Design allows for measuring and retaining maximum temperatures, which must be reset by shaking down. Potential uses include industrial, oilfield, or sterilization applications. Disclaimer: Older models may contain mercury.