TURBIDITY METER A valuable tool in regulatory monitoring, process water testing, and environmental water analysis in the field or laboratory. Also called a nephelometer, it measures the amount of light scattered at right angles from a beam of light passing through the test sample. Uses a tungsten filament lamp as a light source. Accepted by the EPA for compliance with NPDWR and NPDES monitoring programs as specified by USEPA method 180.1. Supplied with four optically selected sample vials with screw caps, standardization package consisting of 0.0, 1.0, and 10.0 NTU standards, instruction manual, Lithium ion rechargeable battery, wall charger, and carrying case. Features: Waterproof to IP67 Lithium ion rechargeable battery USB port 7 languages Backlit display EPA and ISO versions  Includes:  LaMotte 2020WE Portable Turbidity Meter 0, 1, and 10 NTU standard Sample bottle 6 sample tubes USB cable USB computer/wall adapter Waterproof carrying case. Specifications: Range: 0 to 4,000 Nephelometric Turbidity Units (NTUs). Accuracy: ±2%. Response time: 5 seconds. Serial interface: RS232. Power: Lithium ion rechargeable battery and wall charger. Dimensions: 3-3/8” x 6-3/8” x 2-5/8”.