Fertilizers features: LCD Digital Water Quality Meter TDS/EC Temp Tester Hydroponics Aquarium Test Pen Color: we send based on the color or size of the main image of the product page. Quantity：we send based on quantity on title, if there is no quantity in the title, we send based on description. 1. A professional level water test meter combinates with TDS Meter, TDS EC Meter and Temperature Meter. For accuracy and reliability choose the DOY 3-in-1 TDS Meter. 2. The water that flows from our taps is full of chemicals, pollutants and metals. Well, the only way to make sure your water is clean and healthy is to test it regularly. With this TDS tester you can check any time on your water filtration, ensuring that you and your family won't be exposed to unhygienic drinking water. 3.A versatile tool that saves you money while providing the best for your health Features: 1. Lock function: makes it easy to read and record, press HOLD button then remove from test solution. 2. 4 Display modes: press SHIFT button: TDS - ppm & ¡ãC, EC - ¦Ìs/cm & ¡ãC, TDS - ppm & ¡ãF, EC - ¦Ìs/cm & ¡ãF. 3. 5 minute Auto Shut Off feature, so battery won't run down. 4. Measurement Range: Conductivity: 0 - 5000 ¦Ìs/cm Degrees Celsius: 0.1 - 80.0¡ãC Fahrenheit: 32.0 - 176.0¡ãF 5. Accuracy: ¡À 2% 6.Supply voltage:DC3V Instrument characteristics£º TDS,EC,Temperature testing function Lock function SHIFT Automatic conversion function 5 minutes automatic shutdown function How to use ¨ STEP 1: Remove the electrode protective cap before use ¨ STEP 2:Press the ON/OFF button, and immerse the meter into the solution. (The solution should not over the immersion line) ¨ STEP 3: After the numerical display is steady, press the HOLD button and take it out of the solution for checking the result ¨ STEP 4: Wipe clean the electrode after using, turn off the meter and replace the protective cap Package Content: 1 x TDS&EC Meter Note: Please read the manual carefully before using the TDS meter Keep the electrode clean. Always close the electrode protective cap. Please take out the batteries for long periods unused.