4in1 TDS PPM Meter Digital Tester Home Drinking Water Quality Purity Test Tester Features [Pocket Lightweight] - The smallest lightweight portable TGS 70 grams. [wide measuring range] - Range 0 to 9990PPM. [Long Battery Life] -Use large capacity batteries for 5 years. [Reasonable design] - The electrode on the tip of the pen can be inserted directly into the mouth of a bottle for measurement. The cap can also be used as a fluid container for measurement. It is extremely convenient to use. [Measuring speed] -Because the sensing element is extremely naked, a measurement can be made in 5 seconds. [Easy to clean] - The electrode protector can be unplugged to clean the probe and sheath. [Automatic Temperature Compensation] - Automatically converts the indication to the 25 degree indication. Automatic shutdown. [Healthy Living] - take care of the family's health, good water makes them healthier Specifications [TDS Digital Reference Table] 0-50: High purity 50-100: High purity 100-300: General purity 300-600: The scale will be formed 600-1000: Poor quality of water > 1000: not suitable for drinking Precautions Avoid boiling the pen in the water. Avoid high temperature and direct sunlight Avoid shocks and falls.