Ishihara Color Blindness Test Book Available In 24 Plates & 38 Plates 11 baby room thermometer It has continuously variable step-less

It has continuously variable step-less speed control up to 1000 rpm by means of a knob on the front panel

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Ishihara Color Blindness Test Book Available In 24 Plates & 38 Plates 11 baby room thermometer It has continuously variable step-lessIshihara Color Blindness Test Book Available In 24 Plates & 38 Plates 11 Ishihara's color perception test charts are recognized internationally as highly reliable method of determining color deficiency. With normal color perception, the images and numbers will all be visible. Each color test plate in this hard bound. Book is specially printed to measure incrementally higher color sensitivity and specificity. Ishihara test for color blindness, 38 plate