Adlite Disposable Penlight Disposable Penlight features a convenient pupil gauge and streamlined design. A side clip lets you secure this tool on the pocket of any scrub top, pant or lab coat. Sealed, concentric beam Pocket clip activator Pupil gauge at side Carbon zinc AAA battey Brand: American Diagnostic Cor. sku: ADC-356WP-Rry  5" long, 1/2" diameter