A simple device for uniformly streaking TLC plates. Unit consists of a stainless steel base with an adjustable holder for a glass reservoir. To operate, the streaker is placed over edge of the counter top and the plate to be streaked is positioned parallel to it. The bent capillary tip is then adjusted so that it lightly touches the plate. The reservoir is filled with the solution to be chromatographed and by moving the unit back and forth along the counter edge, a uniform streak is accomplished. Supplied complete with glass, stainless steel capillaries, and instructions.