AND Gemini GR [GR-200] Analytical Balance with Internal Calibration, 210g x 0.1mg - 85mm Ø. The AND Weighing Gemini GR-200 Analytical Balance, 210g x 0.1mg with Internal Calibration features splash proof membrane keypad, a large LCD display, and space saving footprint. The GR200's stable die cast aluminum base with built-in internal weight performs automatic self-calibration. The GR200 is easy to operate, clean, and maintain.