Salient Features: A. One-click restoration (to factory settings) B. Simultaneous display of multiple parameters C. Multiple display modes D. Keypress sound feedback Technical Parameters: 1. Measurement range: 0.00–19.99 mg/L 2. Resolution: 0.01 mg/L 3. Control range: 0.00–19.99 mg/L 4. Temperature compensation: 0.0–45.0°C (automatic or manual) 5. Output signal: 4–20 mA isolated protection video conference output 6. Control output method: ON/OFF relay output contact 7. Relay load capacity: Maximum AC 220 V, 5 A 8. Current output load: Maximum allowable load 500 Ω 9. Operating voltage: 220 V ±10% AC, 50/60 Hz 10. Dimensions: 96 × 96 × 140 mm 11. Panel cutout dimensions: 92 × 92 mm 12. Operating conditions: ① Ambient temperature: -5–55°C ② Relative humidity: ≤80% ③ No strong magnetic interference except Earth's magnetic field