WH 11305 3M led distance visual acuitry chart light box

LED Distance visual acuity chart

(WH11305)

LED BACKLIGHT VISION TESTING(PATENT PRODUCT)
Standardized and uniform illumination
Clearly printed optotypes
Can be placed on a table, or hung on a wall
Power supply:AC100~240V(by power adapter), or DC 12V (by optional battery)

 Test distance :3m.  with remote control 

 There are E Chart, number chart, letter chart, child chart. etc.