The Apera TN420 (AI482) is a portable turbidity meter designed for water-quality testing using U.S. EPA Method 180.1. It uses a tungsten filament lamp and 90° nephelometric measurement to detect suspended particles in water. Its automatic range switching, five-point calibration, and IP67-rated housing make it suitable for field testing and laboratory checks of source water, filtration systems, and irrigation water.
• Brand: Apera Instruments
• Model / SKU: TN420 / AI482
• Measurement Range: 0–1,000 NTU/FNU, with automatic range switching
• Measurement Method: 90° nephelometric scattering
• Light Source: Replaceable tungsten filament lamp, 400–600 nm
• Compliance: U.S. EPA Method 180.1
• Calibration: Five points — 0, 20, 100, 400, and 800 NTU
• Display: TFT color screen; blue for measurement and green for calibration
• Battery: Rechargeable 3.7V lithium battery; over 20 hours of continuous use
• Protection Rating: IP67
• Included Accessories: Six sample cuvettes, calibration standards, silicone oil, microfiber cloth, USB cable, power adapter, and hard-shell carrying case
• Warranty: 2 years
Key Advantage: The TN420 combines EPA Method 180.1-compliant measurement with a replaceable lamp, rechargeable battery, and rugged waterproof housing. Its calibration standards and automatic range switching support consistent turbidity checks when monitoring source water and filtration performance. (Hydro Supply Co.)