The wedge slot tray features divergent pins 1.6mm diameter x 12.7mm long that project precisely-spaced dots at 0, 1, 2, 3, 5, 7.5, 10, 15, 17.5, and 20cm in four quadrants at 100cm isocenter. The small dots are highly visible, yet prevent obscuring the film view and allow ease and precision for measurements. The trays are capable of covering an overall projected field size of 40 x 40cm. Contact your account representative to find a tray to fit your needs.