purchase of portable turbidity meter for laboratories under cwa ( w&s ) -i---- 1 the turbidity meter will be able to measure the turbidity in ntu/fnu from 0.01 to 1000 ntu quickly. the instrument will operate on the nephelometric principle of turbidity measurement and is designed to meet the criteria specified in iso 7027 and din 27027 standards. the turbidity meter must be able to measure the turbidity of colored water/waste water also. there will be light source and a detector to monitor the light scattered at 90° with respect to the incident beam. measurement with infrared light at an angle of 90°.a compact instrument for reliable and easy determination of turbidity. a ring memory with 125 data sets and a usb interface guarantee an efficient data management.the instrument will be able to satisfy the turbidity measurement needs in the laboratory and field also and water proof as per ip 67 standards. the oem is required to submit the declaration of conformity in accordance with en iso/iec 17050-1other specifications should be as under;display -lcd, automatic range- 0.01 to 19.99 ntuwith 1 ntu resolution, precision- ±2% of reading; ±1 lsd for 0-500 ntu; ± 3% of reading; ± 1 lsd 501-1000 ntu, response time -< 6 seconds sample requirement-10 ml,calibration - 4 points,calibration standards- 0.02,20.0,100 or 200, and 800 ntu,sample vials - 24-25 mm diameter with indexing mark,light source - ir led,power - 4x aaa>3000 tests , battery conservation - auto shutoff after 20 minutes of inactivity,ambient operating - 0 to 50 °c (0 to 90% non-considering relative humidity at 30 °c),self-diagnostics - yes, with troubleshooting error codes,waterproof rating -ip67, regulatory approvals - ce