Abstract: Provided herewith is a marker that has multiple colors and retracts and seals the ink reservoirs. Also provided is a method of selecting a color.
Abstract: Provided herewith is a marker that has multiple colors and retracts and seals the ink reservoirs. Also provided is a method of selecting a color.
Abstract: Provided herewith is a thermometer that calculates an average temperature between a starting point and a target surface. Also provided is a method of calculating an average temperature in an open space, between a starting point and a target surface. In additional embodiments, a method of calculating a two dimensional average temperature gradient in an open space is provided. Further provided is a method of calculating a three dimensional average temperature gradient in an open space.