5 Year Limited Manufacturer Warranty

it destroys them instantly

The battery will last for up to 1200 charge cycles

Very hygienic: Reduces significantly the risk of contamination

Step-by-step instructions include full-color photos plus rationales explaining why and how to use specific techniques

20 ft: Wall Mount Eye Test Chart - Snellen Housebrand 5 Year Limited Manufacturer Warranty(22" x 11") Snellen chart tests for visual acuity with the familiar letters that progressively get smaller down the chart and is designed for testing at 20 feet. These plastic, non reflecting charts feature a brass eyelet for wall mounting. Charts are designed for 20 foot vision screening.