St-800 Optical Vision Testing Digital LCD Eye Snellen Chart Visual Acuity Chart

St-800 Optical Vision Testing Digital LCD Eye Snellen Chart Visual Acuity Chart. 21.5 Inch LCD Display: Features a 21.5-inch screen with 1920*1080 resolution for clear visual acuity testing. Fast Response Time: Ultra-fast 0.6s response time ensures accurate and efficient eye chart testing. Wide Working Distance: Supports working distances from 1.0m to 6.5m for flexible testing setups. Online Technical Support: Provides dedicated online technical support for customer assistance and troubleshooting. One Year Warranty: Comes with a one-year warranty covering mechanical defects and performance issues. Red/Green Test Capability: Includes Red/Green vision test functionality for comprehensive eye health assessment.