AND Gemini GR [GR-202] Analytical Balance with Internal Calibration,  42/210g x 0.01/0.1mg - 85mm Ø . The A&D Weighing GR202 Gemini Semi-Microbalance features a splash proof membrane keypad, a large LCD display, and a space saving footprint. Its stable die cast aluminum base with built-in internal weight performs automatic self-calibration, making it is easy to operate, clean, and maintain.