Feature 1LED display panel, red light indicates salt concentration, green light indicates power. 2Sensitive response, high measurement accuracy, compact and portable, easy to operate. 3It is suitable for determining the salt concentration in liquid or food, or other salinity monitoring situations. 4Simple operation, put the probe above the liquid surface for at least 2 seconds, the result will be displayed. 5Using ABS shell, copper test table, corrosion resistance,can have longer service life. Item Type: Salinity Meter Product Size: Approx. 21x2.3x1cm / 8.3x0.9x0.4in Material: ABS, Resin, Copper Weight: Approx. 59g / 2.1oz Color: White Display Mode: Indicator Light Battery Parameters: 4xAG13 Button Battery (Battery Not Included) Power Input: 4x1.5=6V LR44(AG13)x4 Working Current: Maximum 20mA (LED All Bright) Measuring Range: 0.3%-2.0% Applicable Temperature Range: 60-80 Calculation Equation: Salt Content = Total Mass x Concentration Package List 1 x Salinity Meter (Battery Not Included) 1 x Manual Note 1. Due to the difference of light and screen, the color of the product may be slightly different from the picture. 2. Due to manual measurement, please allow a difference of 13cm.