This durable turbidimeter provides portable turbidity monitoring— ideal for field use. The waterproof housing ( designed to meet NEMA 4X and IP67) allows sample measurement in any wet environment. The unit features simple calibration procedures and built-in self diagnostics. Advanced microcircuitry design increases lamp and battery life. Features:  Lab accuracy in a rugged, waterproof, handheld meter Meets or exceeds criteria specified in U.S. EPA method 180.1 Auto-ranging from 0 to 1100 NTU Lamp life is 7 to 10 years with normal use Over 5000 tests on a single set of batteries Includes: One set of sealed reuseable primary calibration standards ( 0.02, 10, and 1000 NTU) , three indexing rings, two measuring cuvettes with lightshield caps, four AAA batteries, lens cloth, built-in quick-reference card, and carrying case. Specifications: Product Type: Turbidity Meter. Meter style: Portable. Dimensions ( " W) : 2-3/ 4. Dimensions ( " H) : 1-7/ 8. Dimensions ( " L) : 6-1/ 2. Range ( Turbidity) : 0.01 to 1100 NTU. Resolution ( Turbidity) : 0.01 NTU below 100, 0.1 NTU from 100 to 999.9, 1 NTU from 1000 to 1100. Accuracy ( Turbidity) : ± 2% of rdg or ± 0.01 NTU for 0 to 500 NTU; ± 3% of rdg for 500 to 1100 NTU. Display: LCD. Waterproof: Yes. Power: 4 - AAA alkaline batteries.