Features: 1. It displays the salinity value precisely, compact size and light weight, easy and portable to carry, convenient to use. 2. The pen type salinity meter is a precision instrument for testing the salinity value of a solution. 3. Suitable for saltwater, swimming pool, aquaculture, aquarium (seawater) and pond, food processing and health care products industry. 4. It adopts large screen LCD, PPT standard unit display, power display, power data protection function, automatic temperature compensation, dustproof and waterproof functions. 5. Its full-featured performance, easy operation and replaceable electrodes make it the best choice for rapid, accurate salinity testing in laboratories, sites and schools. Specification: Item Type: Salinity Meter Material: Plastic Measure Range: 0-199.0 Resolution: 35ppt Accuracy: 2% Full Scale ATC: 0-60C Power Supply: 4 x 1.5V (LR44) (Not Included) Size: Approx. 172 x 26 x 26mm / 6.77 x 1 x 1in Weight: Approx. 145g / 5.11oz Package List: 1 x Salinity Meter 1 x Instruction 1 x Screw Note: 1. Please gently stir the electrode during operation. Do not let air bubbles bubble on the electrode. 2. To ensure the measurement accuracy, please do not re-calibrate, it is optional. 3. If there are abnormal phenomena, such as high deviation measured, flickering measurement value, no zeroing, etc., please immerse and clean the electrode with ethanol.