My-V033-D Vision Screening Instrument Portable Refractor Spot Vision Screener. Portable & Lightweight Design: Compact size with 1.2kg weight and 5.5-inch HD screen for easy transport. Long Battery Life: Rechargeable battery ensures over 5 hours of continuous operation. Fast Detection Speed: Detection time is less than 0.4 seconds for efficient screening. Wide Measurement Range: Spherical power -7.50D to +7.50D; Cylindrical power -3.00D to +3.00D. User-Friendly Attraction Mode: Features music and animation to engage children during screening. Multiple Data Interfaces: Supports WiFi, Bluetooth, and USB for flexible data connectivity. Comprehensive QA/QC: 100% inspection of finished products with 3 dedicated inspectors. OEM/ODM Support: Manufacturer offers full customization from samples or designs.