3-In-1 Water Quality Testing Pen, Accurate Detection, High-Definition Lcd Display, High-Precision Probe The Tds Value Represents The Total Soluble Solid Content In The Water. The Lower The Tds Value, The Lower The Ion Content In The Water And The Higher The Purity Of The Water. Temperature Range: 0-60/32-140, All Readings Are Automatic Temperature Compensation Sensors, Which Are Faster And More Accurate Than Direct Contact With The Solution Being Measured. Long Press The Hold/Tempe Button To Convert C/F In Fact, Water Quality Is Closely Related To Health. Good Water Quality Can Delay Aging. Suitable For Aquaculture, Drinking Water, Swimming Pools, Aquariums, Food Processing And Other Application Fields Measurement Accuracy:2%; 0.5 Applicable Fields:Hospitals, Swimming Pools, Disease Control Centers, Water Plant Laboratories, Aquaculture Industry Water Quality Test Pen:TDS Test Pen Type:Portable Water Quality Analyzer Power Supply Voltage:6V Measuring Range:0-9999ppm; 0-9999us/Cm; 0-60/32-140 Resolution:1ppm; 1us/cm Battery:Built-In 4 1.5V Button Batteries Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Colour:As Shown Material:ABS Package Contents: 1 * Invisible Selfie Stick 1 * Instructions In Chinese And English Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.