The large container is used to create a stable environment. The small containers are used to hold the saturated salt solution. The saturated salt solutions generate well-defined humidities when they are confined to a contained environment. Three clear, sealable containers, One container with magnesium chloride solution, One container with sodium chloride solution, Two wooden scrapers, Model Year: 2011, Product ID: 106890, GTIN: 0730650000098