Feature: 1. [High Sensitivity Sensor Probe] The oxygen content detector has a high sensitivity sensor probe, and 3 alarms of sound, light and vibration. 2. [Clear Display] High definition display, clear numbers, clear at a glance, which is easy to understand and read, to meet your various need. 3. [Simple To Use] This gas concentration analyzer is powered by 3 AAA batteries (battery not included) and is easy to use, so you can use it with confidence. 4. [High Accuracy] This oxygen content detector has accurate measurement results, short response time and stable performance. 5. [Widely Application] Widely used in many situations, such as petroleum, chemical, environmental protection, metallurgy and other industries and places. Specification: Item Type: Oxygen Detector Material: ABS Product Size: Approx. 120 x 65 x 25 mm / 4.7 x 2.6 x 1 in Test Gas: Oxygen Measuring Range: 0 ~ 25%VOL Measurement Error: ±2% Resolution: 0.1% Warm Up Time: <10 seconds Response Time: <15 seconds Ambient Temperature Measurement: -15~50℃ Alarm Mode: Sound and light alarm, vibration alarm Alarm: Low concentration 19.5% volume yellow warning light flashing High concentration 23.5% volume red warning light flashing (Alarm concentration can also be set) Continuous Working Time: 6 hours (with slight changes in working status) Power Supply: 3 x AAA batteries (Battery Not Included) Sound Prompt: The higher the frequency of the sound, the higher the concentration Weight: Approx. 170g / 6oz. Package List: 1 x Oxygen Content Detector (Battery Not Included)1 x Manual