- Water Quality Testing Made Easy: Our water quality test pen features a simple instruction manual. Just turn it on, immerse the pen in the solution up to the water level line, gently shake to eliminate air bubbles, and wait about 10 seconds for a stable measurement. Press and hold the HOLD button to capture the reading. After testing, rinse with pure water to maintain accuracy for future tests. - Temperature Testing Functionality: Utilize the pen for temperature measurements in both solutions and air. Simply press the TEMP button to switch the display to show temperature. Press again to return to water quality testing. - Enhanced Features: This water quality test pen allows you to lock in values for easy reading, even outside the water. Designed for long-lasting use with low power consumption, it includes a bright LED screen, is waterproof, and supports multiple functional tests. It also automatically compensates for water temperature, converting TDS values at 25 degrees Celsius. - Versatile Applications: Ideal for a range of uses, including: - Monitoring water quality in purifiers and filters. - Testing the safety of fruits and vegetables. - Ensuring optimal conditions in pools, spas, aquariums, and hydroponic systems. - Professional Quality: This TDS meter tester is a reliable tool for both personal and professional use, ensuring you have access to accurate water quality readings whenever needed.