The HF Scientific DRT-15CE PORTABLE TURBIDIMETER is a rugged, completely self ion contained turbidity monitor with a portable carrying case. Three user selectable ranges. Range: 0-10 NTU, 0-100 NTU, 0- 1000 NTU. Resolution: 0.1% of selected range. Immediate response time. Sample size: 25 ml (16 ml minimum). Batteries: rechargeable 6V gel-cell allows 20 hours of continuous use when fully charged. Includes: DRT-15C, charger, manual. Please contact On-Site Instruments using form provided for details.