Feature: 1. [High Accuracy] Accurate and intelligent instrument that measures turbidity with good linearity, accurate and reliable measurement results, and is easy to operate. 2. [LED Display] Turbidity meter with backlit LED display, which is clear, allowing you to easily read data during the night, to meet your various need. 3. [Durable Material] Made of high quality ABS material, which is durable, safe, stable performance, and can be used for a long time. 4. [Lightweight And Portable] The digital turbidity meter is exquisite in workmanship, lightweight, easy to carry, and can automatically shut down. 5. [Widely Application] Widely used in water works, water treatment plants, swimming pools, food and beverage industries, is an essential instrument for water laboratory. Specification: Item Type: Turbidimeter Material: ABS Product Size: Approx. 21 x 7.5 cm / 8.3 x 3 in Measuring Principle: 90° Scattered light Minimum Indication: (NTU) 0-200 Measuring Range: (NTU) 0.1 Calibration Point: 2 Indication Error: ±6%(±2%F.S) Repeatability: ≤0.5% Zero Drift: ±0.5%F.S Power Supply: DC 1.5V 5 x AA alkaline dry batteries (Battery Not Included) Parameters Voltage: US plug 100-240V 50/60Hz/0.1A/DC5V, automatic shutdown, AC and DC dual purpose Weight: Approx. 1210g / 42.7oz. Package List: 1 x Turbidimeter (Battery Not Included)1 x Adapter3 x Bottle1 x Tube1 x Storage Box1 x Manual Note: The turbidimeter is a combination of photoelectric accurate measuring instruments, the instructions should be read carefully before operation, and corrective measures should be taken to obtain accurate results.1. Must meet the environmental working conditions.2. The measuring cell must be clean and dry for a long time, and the shielding cover must not be covered with dust when not in use.3. In humid climates, the startup time must be extended.4. The test solution should be carefully poured along the sample bottle to prevent air bubbles from affecting the measurement accuracy.5. Recalibrate after changing vials or repairs.6. Non professional maintenance engineers, please do not open the instrument for maintenance.Working conditions:1. The instrument should be placed in a dry room at a temperature of 5°C‑35°C.2. When using, it should be placed on a flat work surfaces and avoid vibration.3. Indoor lighting should not be too strong, and avoid direct sunlight.4. Try to stay away from high‑intensity magnetic fields, electric fields and electrical equipment that generates high frequency waves.5. Avoid high temperature close to the instrument.6. Power supply to the instrument: 220V±22V, 50±1Hz, and must be equipped with a good ground wire.7. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Turbidity liquid is required for the calibration of this product, but the delivery does not contain turbidity liquid. Please purchase turbidity liquid 400NTU or turbidity liquid 200NTU for calibration. You can purchase one of them.