AND Gemini GR [GR-120]  Analytical Balance with Internal Calibration, 120g x 0.1mg - 5mm Ø. AND Weighing Gemini GR-120 Analytical Balance, 120g x 0.1mg with Internal Calibration features splash proof membrane keypad, a large LCD display, and space saving footprint. The GR120's stable die cast aluminum base with built-in internal weight performs automatic self-calibration. The GR120 is easy to operate, clean, and maintain.