Accurately measure dissolved oxygen levels and temperature in various water sources with this advanced Dissolved Oxygen Meter, designed for quick and reliable on-site testing. Its compact, pen-shaped design makes it lightweight and portable, allowing you to conveniently monitor water quality anywhere. Crafted from durable ABS material, this meter provides high accuracy with fast response times, ensuring you get precise readings of dissolved oxygen from 0.0 to 30.0 mg/L and temperature from 0 to 40.0℃ (32.0 to 104.0℉). Key Features: · High-Precision Measurement: Offers accurate dissolved oxygen readings with ±1.5% full scale accuracy and temperature accuracy within ±0.5℃. · Fast Response Time: Provides results within 45 seconds, enabling efficient water quality monitoring. · Wide Measurement Range: Measures dissolved oxygen (0.0-30.0 mg/L), dissolved oxygen saturation (0.0-300%), and temperature (0-40.0℃; 32.0-104.0℉) to accommodate diverse testing needs. · Automatic Temperature Compensation: Ensures stable and precise readings by automatically compensating temperature variations from 0 to 40℃. · Easy Calibration: Supports both single-point and double-point automatic calibration, including null point and 100% air calibration for reliable accuracy. · Portable and User-Friendly Design: Compact size (approx. 155x35mm) with a 1.15m cable and 150mm electrode length, lightweight at 331g, perfect for fieldwork and easy storage. · Versatile Applications: Ideal for freshwater aquaculture, mariculture, swimming pools, beverage production, sewage treatment, laboratories, and other water quality monitoring scenarios. · Energy Efficient: Equipped with automatic shutdown after about 8 minutes of inactivity to conserve battery life, including low battery warning for timely replacements. Specifications: · Material: ABS · Size: Approx. 155x35mm (6.1x1.38in) · Cable Length: Approx. 1.15m (3.8ft) · Electrode Length: Approx. 150mm (5.9in) · Weight: Approx. 331g (11.7oz) · Measuring Range:  - Dissolved Oxygen: 0.0-30.0 mg/L  - Dissolved Oxygen Saturation: 0.0-300.0%  - Temperature: 0-40.0℃; 32.0-104.0℉ · Resolution:  - Dissolved Oxygen: 0.1 mg/L  - Saturation: 0.1%  - Temperature: 0.1℃/0.1℉ · Accuracy:  - Dissolved Oxygen: ±1.5% F.S.  - Saturation: ±1.5% F.S.  - Temperature: ±0.5℃ · Calibration: Single-point or double-point automatic calibration · Response Time: ≤45 seconds (90% response at 20℃) · Automatic Temperature Compensation: 0-40℃ · Power Supply: 3 x 1.5V LR44 batteries (not included) · Operating Environment: 0.1-40.0℃, RH ≤ 90% Package Includes: 1 x Dissolved Oxygen Meter This Dissolved Oxygen Meter combines precision, convenience, and versatility, making it an essential tool for professionals and enthusiasts who require dependable water quality monitoring in various environments.