JH-39 Normal 5M standard visual chart light box, 10CM thickness
$
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Specification: | |||||||
Type of chart: | E charts, red/green balance chart | ||||||
Distance of testing: | 5m | ||||||
Range of testing: | from 4.0 to 5.3 | ||||||
Record of vision: | five points record, decimal record, fraction record | ||||||
Size: | 920 * 280 * 100mm |