This economical monitor is simple to operate and features a unique patented sensor that is highly accurate

Features a large 3-digit LCD, factory-set alarm and molded high-impact case. The unit has accuracy to ±4% over the full 0–50°C range, resolution to 0.1% oxygen, and a rapid response time of 10 seconds to 90% indication. Weighs only 312g (11oz.) and is small enough to fit inside a pocket. Comes complete with a 9V battery (up to 200 hours operation), and a 99cm (39") long cord for earphone use. No field adjustment required.