Fangrui Product Details Fangrui Product Details Features: 2.8 Inch Lcd Hd Color Display. Display The Oxygen Concentration And Temperature And Humidity Values, The Curve Interface. Oxygen Excessive Alarm Buzzer Sound (excessive Alarm Sound Can Be Eliminated By Pressing Any Key) + Digital Color Change (alarm Value Default Standard Value), You Can Set - Alarm Value. Data Saving Function (can Store 100000 Data), Set Timing Storage, Delete Data, View Historical Data. Please Note: The Physical Slightly Color Difference Or Difference, Does Not Affect The Use, Please Do Not Mind, Thank You! The Display Brightness Adjustment -, The Default Brightness Of , 10 Seconds After The Screen Saver Minimum Brightness, Any Key Can Be Restored To Brightness. Celsius C And Fahrenheit F Switch, Long The Key To Switch. Specifications: Model: A8 Material: Abs Display Method: 2.8 Inch Tft Full Color Led Backlight Lcd Screen Oxygen Measurement Range: 0-vol Oxygen Resolution: 0. Temperature Measurement Range: -955humidity Measurement Range