The Portable Field Kit Model 11520 (battery and AC) has been designed and rigorously tested to meet all EPA standards for turbidimetric water testing. Incorporates a triple photo diode detection system that gives stable, reliable readings down to 0.02 NTU with 0.001 NTU resolution. The precision lamp, with built-in lens, requires no alignment and will operate continuously for more than 5,000 hours — over 7 months at 24 hours a day. Included with the meter: 0.5 NTU secondary standard, 10 NTU secondary standard, 0.5 NTU primary standard (60 ml), 10 NTU primary standard (60 ml), light shield, two optically-selected sample vials, and a rugged carrying case.

Specifications:
Ranges: 0-2, 0-20, 0-200 NTU.
Resolution: 0.1% of range.
Sample well: 25 mm diameter.
Size: 6""H x 6""W x 3""D.
Weight: 2.5 lbs.
Power: 110 volt plus internal battery.
Warranty: 1 year.