Probe: Test for salt concentration. The 7 red LEDs respectively indicate the salt concentration: 0.3%~0.6% (moderate); 0.8%~1.0% (strong); 1.3%~2.0% (too strong), the corresponding parameters are only for reference, due to personal tastes , please try it yourself. 1 green LED for power indication. ON button: Press and hold the button, and the test can be performed when the power is turned on. Stop testing when released. Check whether the probe of the salt tester is clean, if it is not clean, please clean it with a neutral detergent. Put the object to be tested into a container with a certain height. Press the ON switch of the salt tester and see that the Power indicator lights up green. If it does not light up, it means that the battery voltage is too low and a new battery needs to be replaced. Insert the probe of the salinity tester into the solution at least 2CM, and test at a distance of at least 1CM from the wall of the container. After the display is stable, read the last reading of the red light that has been on, which is the detection value. After the test, clean the probe part of the salt concentration tester with a neutral detergent [Storage] Drop or strong shock, otherwise it will cause the failure of the salt concentration tester. It should be kept away from high temperature, direct sunlight, humidity, etc. If you do not use the salt concentration test timer for a long time, please remove the battery. 1. No more than 6 grams per day for healthy adults 2. No more than 5 grams for diabetic patients 3. No more than 3 grams for hypertensive patients 4. No more than 2 grams for diabetic hypertensive patients Children should be less than adults, special attention, automatic temperature compensation function, measuring temperature 70-90 degrees Celsius Please note that due to the possible color and size difference between the light effect photo and the real object, please allow 1-2 cm error Quantity: (1 Piece), Salt Test Pen 'does not contain batteries, other products are not included Dimensions: 21224.815.4 (mm) Color as shown