An accurate putter device comprises a frame having a pair of blinds slidable within an aperture in the frame. A thumb dial mounted on each side of the frame controls a particular blind to narrow the golfer's line of sign through the aperture so that the golfer may line-up the putt and read the grade or angle of the green towards the hole. The thumb dials are coupled to the threads running through the blinds to move the blinds to and fro along tracks in the frame to line-up the ball with respect to the hole.