The mask visual field tester is used to test the visual field effect of masks, face masks, respiratory protection products and other products. Use of Mask Visual Field Tester: It is used to test the visual field effect of masks, face masks, respiratory protection products and other products. Standards Compliant: GB 2890-2009 Respiratory protection Self-priming filter gas mask 6.8 GB 2626-2019 Respiratory protection products Self-priming filter anti-particulate respirator 6.10 GB/T 32610-2016 Technical Specification for Daily Protective Mask 6.12 EN136: Respiratory Protective Devices-Full Face Masks-Requirements, Testing, Marking Product Features: 1. Large-screen touch screen control and display. 2. Fully automatic testing and data results. 3. Configure computer online analysis software. Technical Parameters: 1. Display and control: 7-inch color touch screen display and control, parallel metal button control. 2. The radius of the arc bow (300-340) mm: it can be rotated around the level of 0°, and there is a scale every 5° from 0° on both sides, extending to 90°. There is a slidable white visual mark on the arc bow. 3. Recording device: The recording needle is linked with the optotype through the shaft wheel assembly, and records the position and angle of the optotype on the visual field drawing. 4. Standard head shape: the apex of the bulb of the pupil position device of the two eyes is 7±0.5mm behind the midpoint of the two eyes. The standard head shape is installed on the worktable so that the left and right eyes are placed at the center of the semi-circular arc. Look directly at its "0" point. 5. Power supply and power: 220V, 50Hz, 500W 6. Dimensions (L×W×H): 580mm×380mm×700mm 7. Weight: about 50Kg Configuration List: 1. One host. 2. One Lenovo software CD. 3. One communication line. 4. A product certificate. 5. A product instruction manual. 6. A delivery note. 7. An acceptance sheet. Optional Accessories: 1. One brand computer; 2. 1 brand printer