Feature:1. [High Accuracy] Dissolved oxygen detector is sensitive, accurate in measurement, and with automatic temperature compensation.2. [LCD Display] Dissolved oxygen analyzer with large TN LCD display, wich is simple to operate, to meet your various need.3. [Portable] Specially designed for the convenience of users to carry to the scene and is divided into two parts, which is sensor and electronic unit.4. [Digital Chip] Adopts extremely general coated dissolved oxygen electrode, and the electronic unit uses a detection circuit designed by a digital chip.5. [Backlight Display] The digital tube backlight display is added, which can display the readings in real time, and the readings can still be clear under low light conditions.How to Use:Specification:Item Type: Dissolved Oxygen AnalyzerMaterial: ABSProduct Length: Approx. 170mm / 6.7inWidth: Approx. 78mm / 3.1inHeight: Approx. 29mm / 1.1inBattery: 3 x AAA battery (Battery Not Included)Dissolved Oxygen Measurement Range: 0-20mg/LDissolved Oxygen Acuracy: ±3.0%Dissolved Oxygen Resolution: 0.01mg/LTemperature Measurement Range: -45~115℃Temperature Resolution: 0.1℃Working Temperature: 5℃~40℃Working Humidity: 0~90% (relative humidity), non condensingApplication: Laboratories, aquariums, aquaculture, rice fields, swimming poolsWeight: Approx. 640g / 22.6oz1. Operation Panel: There is a TN LCD display on the front of the device, and there are 6 operation buttons, namely, the on off key, the Menu key, the up key, the do