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WATER QUALITY ALERT: Smiley and frowny icons help users understand TDS readings at a glance. A clear visual guide makes everyday freshwater checks easier for beginners and family use. 4 IN 1 DIGITAL TESTER: Measures TDS, EC and temperature in one compact meter, with a backlit display for easier reading in different light conditions. Designed for quick reference checks at home. 0-9999 PPM TDS & EC RANGE: Supports TDS 0-9999 ppm, EC 0-9999 μS/cm and temperature 0-60°C / 32-140°F. Useful for comparing tap water, filtered water, aquariums and hydroponic systems. USES 2 AAA BATTERIES: Powered by 2 standard AAA batteries, not included. Designed for convenient replacement and suitable for using existing or rechargeable AAA batteries. EASY HOLD & PORTABLE USE: Uncap, switch on, immerse the probe between the min/max lines and press HOLD to lock the reading. For freshwater use only; do not use in saltwater or submerge beyond the line.