Left Select: m^2, km^2, hm^2, dam^2, dm^2, cm^2, mm^2, um^2, nm^2, ha, a, b, mi^2, yd^2, ft^2, in^2, ac, ch^2, mil^2,
Right Select: m^2, km^2, hm^2, dam^2, dm^2, cm^2, mm^2, um^2, nm^2, ha, a, b, mi^2, yd^2, ft^2, in^2, ac, ch^2, mil^2,
Left Select: square meter [m^2], square kilometer [km^2], square hectometer [hm^2], square dekameter [dam^2], square decimeter [dm^2], square centimeter [cm^2], square millimeter [mm^2], square micrometer [um^2], square nanometer [nm^2], hectare [ha], are [a], barn [b], square mile [mi^2], square mile (US survey), square yard [yd^2], square foot [ft^2], square foot (US survey), square inch [in^2], circular inch, township, section, acre [ac], acre (US survey), rood, square chain [ch^2], square rod, square rod (US survey), square perch, square pole, square mil [mil^2], circular mil, homestead, sabin, arpent, cuerda, plaza, varas castellanas cuad, varas conugueras cuad, Electron cross section,
Right Select: square meter [m^2], square kilometer [km^2], square hectometer [hm^2], square dekameter [dam^2], square decimeter [dm^2], square centimeter [cm^2], square millimeter [mm^2], square micrometer [um^2], square nanometer [nm^2], hectare [ha], are [a], barn [b], square mile [mi^2], square mile (US survey), square yard [yd^2], square foot [ft^2], square foot (US survey), square inch [in^2], circular inch, township, section, acre [ac], acre (US survey), rood, square chain [ch^2], square rod, square rod (US survey), square perch, square pole, square mil [mil^2], circular mil, homestead, sabin, arpent, cuerda, plaza, varas castellanas cuad, varas conugueras cuad, Electron cross section,
