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[Amazon] Likday 3-in-1 TDS Water Tester - $2.93 (was $5.87)
Features:
- Works for testing drinking water, RO systems, aquariums, pools, and hydroponics
- Measures TDS (Total Dissolved Solids), EC (Electrical Conductivity), and temperature in both °C and °F
- Includes reference chart on back for interpreting TDS readings
- Large backlit LCD display for easy reading in low light conditions
- Auto-lock function holds readings for convenient data recording
- Auto-off feature turns device off after 2 minutes to save battery life
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