MICROPROCESSOR TURBIDITY METER : EM – 81M Display 16X2 Lines Alfa Numeric. Rang 2 ranges 0 to 200 & 200 to 1000 Jtu/ntu. Accuracy ±3% of Full Scale Deflection in 0-1000 Jtu/ntu. Sample System 30 mm Clear Glass Cuvettes. Light Source 6.8 Volt, 0.3 Amps Tungsten Lamp. In built memory to retain both range standard solution and last set value even after power loss.