3 IN 1 Digital TDS, EC and Temperature Meter Total Dissolved Solids(TDS) are the total amount of mobile charged ions, including salts or metals dissolved in a given volume of water. TDS, which is based on conductivity, is expressed in parts per million(PPM) or milligrams per liter(mg/L). TDS includes aby inorganic element present other than the pure water molecule (H2O) and suspended solids. TDS affects drinking water quality consumption. For drinking, the lower TDS level of the water, the better for your health. The U.S. EPA's Maximum Contaminant Levels of TDS for human consumption is 500 ppm. Measures total dissolved solids (TDS, mg/L), electrical conductivity (EC, µs/cm), temperature (°C) and Fahrenheit (°F) Instructions: 1. Remove the cap from the pen and turn the switch on. 2. Dip the pen into the test solution but not more than 2cm. 3. Stir the pen in the solution, then stay stable and after 2-6 seconds the TDS value will display on the screen. Press the hold button to save the value and then look at it. 4. After using, dry the head the of the pen and put the cap back on. 5. The U.S.EPA`s Maximum Contaminant Levels of TDS for human consumption is 500ppm. Please note: The body of the TDS pen should not be exposed to liquids, direct sunlight or high temperature. Avoid dropping it. Parameters 1. TDS: range 0-4990ppm, accuracy TDS ≤ 100ppm, ± 2ppm.TDS > 100ppm, ± 2%. 2. EC: range 0-9990 µs/cm, accuracy ± 2% 3. Temperature: range 0~99℃ (32-212°F), accuracy ±0.1℃. 4. LCD display: 34*17mm, TDS ≤ 40ppm green light, TDS > 40ppm red light. 5. Battery: 1000 hours for continuous testing. 6. Size: 163*27.6*14.6mm. 7. Net Weight: 53g (1.87 oz.). Package contains: 1 x TDS Meter 1 x 3V CR2032 Button Cells 1 x TDS Meter Case 1 x TDS Meter User Manual

• TECHNICAL SPECS: TDS: 0-4999ppm, Accuracy: ± 2%; EC: 0-9990 µs/cm, Accuracy: ± 2%; Temp: 0-99°C, 32.0-212.0°F, Accuracy: ± 0.1°C.
• PROFESSIONAL QUALITY: Made out of the the finest quality materials available, our ATC meter is much more durable than any other affordable TDS meter currently on the market.
• EASY TO USE TDS METER: Each one of these TDS water meters is equipped with a digital display that makes it easy to read levels, know when it's time to change the filter and adjust settings are needed
• COMPACT, PORTABLE SIZE: The small, slim size of our high range TDS meter allows you to take it with you to test water on the go.
• DISPLAY: Large LCD display with backlight, TDS ≤ 40ppm green light, TDS > 40ppm red light.

TECHNICAL SPECS: TDS: 0-4999ppm, Accuracy: ± 2%; EC: 0-9990 µs/cm, Accuracy: ± 2%; Temp: 0-99°C, 32.0-212.0°F, Accuracy: ± 0.1°C.AILOOP