Vet Video Colonoscope(Maxco 128V) Model: Maxco 128V Specfication: Diameter of distal-end: 13.4mm Diameter of insertion tube: 13mm Working length: 1330mm Diameter of instrument channel: 3.2mm Field of view: 120°°deg;° Depth of field: 3-100mm Center Resolution: ≥ 7.41 Lp/mmp/mmp/mm Angulations: 180° Up/Down, 160° Right/Leftight/Leftight/Left Water flow: ≥ 45ml/min/min/min Air flow: ≥ 800ml/min/min/min Suction flow: ≥ 400ml/min/min/min *You can also choose other specification from Shinova: Maxco 118V: Distal-end diameter is 11.8mm;