Measures TDS levels in triple water lines. Highly efficient and precise with advanced microprocessor technology. Auto-off feature saves battery power, shutting down after 10 minutes of inactivity. Wide range: 0-9990 ppm (1 ppm resolution for 0-999 ppm, 10 ppm resolution for 1000-9990 ppm, shown by blinking 'x10' indicator). Factory-calibrated using 342 ppm NaCl solution; recalibration possible with a mini-screwdriver. TRM1 Triple TDS Meter with three probes. Includes Mur-lok Quick-Connect T-fitting (1/4" standard; 3/8" or 1/2" also available). Easy and quick installation. Specifications: Range: 0-9990 ppm Accuracy: ��2% Conversion Factor: NaCl (0.5) Cable Length: 24.5" (including sensor) Fittings: 1/4" standard (3/8" or 1/2" optional) Power: 2 x 1.5V button cell batteries (LR44 or equivalent; not included) Battery life: ~1000 hours continuous use Note: Product may vary slightly in appearance due to batch differences, but functionality remains unaffected. Color: As shown (may vary slightly due to lighting or display settings). Material: Plastic Package includes: 1 x Water Quality Tester Only the listed items are included. Measurement tolerance: ��1-3 cm.