TEC 2021: Alvarado Presents Touch-Free Full Hight Turnstiles and Optical Turnstiles May 7, 2021 | Home / May 7, 2021 rave-video / TEC 2021: Alvarado Presents Touch-Free Full Hight Turnstiles and Optical Turnstiles TEC 2021: Alvarado Presents Touch-Free Full Hight Turnstiles and Optical Turnstiles