The length of the eyeball (either longer or shorter), changes in the shape of the cornea, or aging of the lens can cause refractive errors. Most people have one or more of these conditions. The cornea and lens bend (refract) incoming light rays so they focus precisely on the retina at the back of the eye.
BF series Composite strain gauge. This gauge is designed for measurement on composite materials. It has a specially designed grid configuration to reduce the tightening effect of the gauge to the specimen. As the temperature compensation is available for material with thermal expansion coefficient of 3, 5 or 8ppm/Â°C, this series is recommendable for ceramic, carbon, and composite materials.
Select the Series 2000 Magnehelic gage for high accuracyâguaranteed within 2% of full scaleâand for the wide choice of 81 models available to suit your needs precisely.elect the Series 2000 Magnehelic gage for high accuracyâguaranteed within 2% of full scaleâand for the wide choice of 81 models available to suit your needs precisely.