DIGITAL AUTO COLORIMETER ANALYZER : EM – 57P Display 16X2 line alphanumeric LCD. Display Modes %T, AB& # Concentration modes C1,C2,C3. Zero Adjustment Automatic (without knob rotation). Accuracy ±0.02 O.D. Stability ±0.02 O.D Per Hour. Light Source 6.8Volt,3 Amps Tungsten Lamp. Sample Volume 1ml Minimum. Amplifier Micro Controller Based In Built Memory to retain three Concentration and last “K” factor for Concentration even after power loss.