YiERYi YG-9908 4 In 1 Water Quality Tester PH / TDS / EC / Temperature Multifunctional Testing Pen With High Accuracy Portable Design

• Equipped with a backlit LCD screen for clear result display
• Features one-touch calibration (MODE/CAL button) for easy operation
• Comes with a HOLD function to save measured data
• Upgraded high-sensitivity glass electrodes ensure stable and accurate measurements
• Powered by 3 x LR44 1.5V button batteries for long-lasting performance
• Compact dimensions (178×43 mm), lightweight and portable

• Shell Material: High-strength engineering plastic, durable and drop-resistant
• Button Functions:
  • ON/OFF Button: Turn the device on/off
  • MODE/CAL Button: Switch modes and calibration
  • HOLD Button: Lock data
  • °C/°F Button: Switch temperature units
• Clear digital display with backlight for low-light environments
• Comes with a protective cap to prevent electrode damage

• Calibrate regularly before first use and periodically afterward
• Rinse electrodes with clean water after each use
• Avoid measuring highly corrosive liquids or extended water immersion
• Replace batteries when screen dims or device fails to power on
• Store in a dry, cool place away from direct sunlight

With its accurate measurements, 4-in-1 functionality, and wide range of applications, the YiERYi YG-9908 is the perfect choice for anyone looking to ensure water quality in swimming pools, aquariums, hydroponic systems, or household drinking water. Its portable design, easy-to-use interface, and durable construction make it an invaluable tool for professionals and hobbyists alike.