Feature: 1. The 2‑in‑1 tester can accurately measure TDS and EC to clearly understand the water quality. 2. The tester can test the TDS of water in different environments, which is practical and convenient. 3. The tester has a waterproof function, whose rating is IP65. And it use high-quality material, which is durable. 4. The conductivity reading is automatically temperature compensated, and the liquid temperature is displayed at the same time, which can be switched between Celsius or Fahrenheit. 5. Small and dexterous, easy to carry, easy to operate, and strong in practicability. Specification: Item Type: Water Quality Tester Material: ABS+PCB Weight: Approx. 118g / 4.2oz Measuring Range: 0~19990μS/cm Resolution: 10μS/cm; temperature: 0.1℃ Accuracy: ±2% F•S Working Environment: 0°C ~ 50° C Automatic Temperature Compensation: 0℃ ~50℃ Battery: 4 x 1.5V (AG13) (Battery Not Included) How to Use: 1. Remove the cap of the test pen and press the power button to fill 2/3 of the cap with the water to be tested. 2. Put the pen into the water to be tested and gently stir to remove air bubbles in the water. 3. Wait for the reading to stabilize after 3 seconds, and bserve the reading on the display.. Package List: 1 x Water Quality Tester (Battery Not Included)1 x Screwdriver1 x Manual