Selecting By Tonal Range

The Select > Color Range command can be used to select very general tonal ranges such as highlights, mid tones and shadows.  The magic wand tool is very useful in selecting ranges of colors and tones.  But there is no tool for the selection of tonal ranges by their numeric values.  The digital tonal range goes from 0 to 255.  If you wanted to select all pixels that fall within 115 to 140, there is no built in Photoshop tool that does this.  However, there are JavaScript programs on the Support page that you can download that will allow you to precisely select pixels that fall within a specific numeric range.