Analysis Balance are highly sensitive laboratory instruments designed to accurately measure mass. Their readability has a range between 0.1mg - 0.01mg. They have a draft shield or weighing chamber to prevent the very small samples from being affected by air currents. They're meant to detect very fine increments, so the slightest vibrations or breeze can impact the results. They are typically used in a dedicated room with as few disturbances as possible. Analysis balances need to be monitored carefully and calibrated frequently. Most analysis balances have both automatic internal motorized calibration and calibration with external weights.