Usage Tips:Brief introduction: This is a mini pocket tester. It is widely used for analyzing the purity of oxygen in respirator machine of medical treatment, anesthesia machine, oxygen concentrator, high-pressure oxygen house and nursing case for infant. It is comprised of oxygen sensor (oxygen electrode), secondary meters etc. It is light, firm and portable. Specification: * Running temperature : -1040 * Relative humidity: =< 90%RH * Power: one piece of battery (DC9V) (You need to buy it yourself). * Test range: 0100, 025, 05 * Precision 0.15when oxygen is less than 50.3525, 3above 50 * Error: =< 0.01% * Display: integration method, 3 1/2 LCD * Respond time: indicates the 90% concentration in 10 seconds, when the temperature is 20 * Detecting precision disturbing gas: when SO2, NO2, H2S etc 10, they will affect the detect precision. * Sensor: electrochemistry sensor * Dimension: 1608528mm * Weight: 185g * Power supply: 6F22-9V battery (Battery is NOT included) * Power consumption: 4 mwPackage includes:1 x Oxygen Concentration DetectorWhen shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specificationsWe want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don't hesitate to contact us. We are here to help and will do our best to assist you.Thank you for choosing our product. We hope you enjoy it