Mi 415 has two operating ranges; 0.00 to 50.00 FNU, and 50 to 1000 FNU that can accommodate the most turbid condition you may encounter.

Specifications:-

• Range 0.00 to 50.00 FNU; 50 to 1000 FNU
• Resolution 0.01 FNU; 1 FNU
• Accuracy ±0.5 FNU or ±5% of reading, whichever is greater
• Detection of scattered light method
• Light Source high emission infrared LED
• Light Detector silicon photocell
• Environment 0 to 50°C / 32 to 122°F; max RH 100%
• Battery Type 1 x 9V
• Auto-off after 5 minutes of non-use