With the Critical-Line™ Quantum LED, variables such as illumination on the chart face and chart viewing angle are effectively eliminated, ensuring accurate and reliable results with every screening. Say goodbye to the hassle of adjusting lighting conditions or struggling with viewing angles.
What is included:
A Critical-Line Quantum LED Device
LEA SYMBOLS®/Sloan Letter Distance Chart set with response keys
A power adapter
Wireless remote control
A 10ft measuring cord
Grey occluder
Additional Resources
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