Clearly marked indicating creosote buildup, optimum performance, and overheat zones for safe operation. Convenient magnetic placement with a strong magnet for secure mounting on stove tops or single-wall flue pipes. Wide temperature range measuring from 100-900 ℉ (100-500 ℃) for practical home use. Large, easy-to-read for quick temperature monitoring to adjust or airflow efficiently. Helps maintain ideal burning conditions, reducing creosote deposits and protecting your stove, chimney, and stove fan from overheating damage.