... 660nm Specification: Digit Size: 1.0"Material: GaAlAs/ GaAsEmitted Color: hi ... Type of display height:0.28 inch,0.3 inch,0.32 inch,0.36 inch,0.4 inch,0.5 inch,0.52 inch,0.56 inch,0 ... .6 inch,0 ... .8 inch,1.0 ... inch,3.0 inch,4.0 inch,5.0 inch,8.0 inch. 2 ...