Specifications: Model: NR20XE Viewing Geometry: 45°/0° Aperture: Φ20mm Detector: Silicon photoelectric diode Color Space: CIEL*a*b*C*h*; CIEL*a*b*; CIEXYZ Color Difference Formula: △E*ab; △L*a*b*; △E*C*h* Light Source: D65 Light Source Device: LED blue light excitation Storage: 100pcs standards 20000pcs samples Repeatability: Standard deviation within ΔE*ab 0.08 Average of 30 measurements of standard white plate PC Software: CQCS3 Software Power source: Rechargeable lithium-ion battery 3.7V@3200mAh Lamp Life: 5 years, more than 1.6 million measurements Charging Time: 8 hours Weight: 500g Dimension: 205×67×80mm Printer (optional): Miniature thermal printer