Features:1. This oxygen detector is widely used in industry and can be found in locations to monitor manufacture processes and emerging technologies.2. With a large screen display the measured results, you can get oxygen concentration at a glance.3. The gas detector can alert the operator in the area where the leakage occurred, giving them a chance to leave.4. Widely used in chemical industry, electronic industry, underground operations, in-car oxygen detection.5. Maximum/minimum hold feature for measuring absolute high/low peaks and hold data.6. The product is ergonomically designed for easy handling and operation, perfect for household and working testing.Specification: Item Type: Oxygen Detector Material: ABSMeasurement Range: 0-25% volumeMaximum Overload: 30% oxygenResponse Time: <15sSensor Type: Electromagnetic oxygen sensorAmbient Humidity: 15-90%RHPower Supply: 3x1.5V AAA Battery (Not Included) Package List: 1 x Oxygen Detector1 x Instruction 1 x Black Box