DIGITAL COLORIMETER Octa-1 Plus Light Source – LED ClusterNine Filters – 410, 430, 470, 490, 520, 540, 580, 610, 640Adjust of 0.00 OD Reading by Auto ‘ZERO’Durable Performance with Low Energy ConsumptionLED Cluster-based Filter Selection Technology Long Life of LED Cluster 0 Cool Number 0 Cool Number 0 Cool Number 0 Cool Number TECHNICAL SPECIFICATION Filter / Source Hermetically sealed LED cluster with peak emission wavelengths at 410, 430, 470, 490, 520, 540, 580, 610 and 640 nm Test Tubes 75 x 12 mm with 10 mm path length and 1 ml min. Vol. Detector Silicon, Hermetically sealed Power 230V AC Single phase with ground