["brand new and high quality\nFeatures:\nMade of high quality material, solid, durable and good performance, long service life.\nIt adopts a natural diffusion method for detecting oxygen concentration, using high performance electrochemical sensor, with excellent sensitivity and excellent repeatability.\nIt can effectively prevent people from hypoxia and oxygen poisoning, and ensures the safety of The staff's life is not infringed.\nIt features embedded micro control technology, simple operation, complete functions, high reliability.\nLow concentration 19.5%VOL yellow warning light flashing., and high concentration 23.5%VOL red warning lights flashing, alarm concentration can also be set up.\nAnd it has sound, light and vibration alarm, you never miss it.\nLarge LCD display, clear menu operation interface, battery power real for time display, easy to operate.\nLight and compact size, easy to carry and store.\nPerfect for explosion-proof, are widely used in metallurgy, power plant, chemical, mine, tunnel, underground pipelines or mines and other places, \nOxygen Meter only, other accessories demo in the picture is not included!\n\nSpecification:\nPowered By: 3 x AAA Batteries (Not included)\nMaterial: ABS, Electronic Components\nSize: app.12 x 6.5 x 2.5cm/4.72 x 2.56 x 0.98in\nColor: Blue\nQuantity: 1 Pc\n\nProduct Parameters: \nTest Gas: Oxygen \nMeasurement Range: 0-25%VOL \nMeasurement Error: ±2% \nResolution: 0.1% \nPreheating Time: Less than seconds \nResponse Time: Less than 15 seconds \nEnvironmental Temperature Measurement: -15 ~ 50℃ \nAlarm mode: Sound alarm, light alarm, vibration alarm \nAlarm: Low concentration 19.5%VOL yellow warning light flashing\n High concentration 23.5%VOL red warning lights flashing (alarm concentration can also be set up) \nContinuous Working Time: 6 hours (With a slight change in the working state) \nAudio Tip: The higher the frequency of the beep sound, the higher the concentration is. \n\nNote:\nNo retail package.\nPlease allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.\nDue to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\n\nPackage includes:\n1 x Oxygen Meter"]