The instrument, Model 8500 Handheld Pulse Oximeter simplifies patient monitoring from spot checking to continuous checking. The product is a convenient and handy Digital Pulse Oximeter. The tool is user friendly because of its portability and 3 buttons operation. The bright large LED display is ideal for viewing image. Its accuracy is guaranteed with its reliable proven Nonin Medical pulse oximetry technology which is compatible with Nonin's full line of PureLight® Sensors. The battery works for 100 hours continuously. This flexible tool has various types of documentation options.