TURBIDITY METER Features: Measures the turbidity of an aqueous solution Range of 0 to 50 NTU or 50 to 1000NTU Microprocessor-based circuitry ensures high accuracy and repeatable readings Requires only a 10mL sample size to work 2-point calibration Splash-proof front panel Battery operated - ideal for use out in the field or on-site Data hold function MIN/MAX record/recall Auto power off The Extech TB400 tests the turbidity of several different aqueous solutions including municipal water and food/beverage water. Designed for use on-site rather than in a laboratory, the TB400 works with a 10mL sample and determines turbidity from 0 to 50NTU or 50 to 1000NTU (nephelometric turbidity units) with resolution of 0.01NTU and accuracy of ±5% FS or ±0.5NTU (whichever is greater). This turbidity meter uses microrprocessor-based circuitry, ensuring that measurements are carried out with high accuracy and are easily repeatable. It also runs entirely on batteries for use out in the field and includes additional functions such as data hold and MIN/MAX calculations with record/recall. Includes: Extech TB400 Portable Turbidity Meter 0 NTU Standard Solution Test Bottle 100 NTU Standard Solution Test Bottle Cleaning Solution (Distilled Water) 2 x Test Bottles and Covers Cleaning Cloth 6 x AAA Batteries Hard Carrying Case Specifications: Range (NTU):   0 to 50NTU, 50 to 1000 NTU (Nephelometric Turbidity Unit). Resolution:  0.01NTU. Accuracy:  ±5% FS or ±0.5NTU, whichever is greater. Light Source:  LED, 850nm. Standard:  Designed to meet ISO 7027.  Response Time:   <10 seconds. Dimensions:  6.1 x 3.0 x 2.4" (155 x 76 x 62mm). Weight:  11.3oz (320g).