Light dependent resistors, also called photoresistors, are simply resistors whose resistance changes based on how much light is falling on them. All of my LDRs go from close to zero ohms of resistance, under very bright light, to over 200 million ohms (200MΩ) when completely covered.
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Affiliate link ad. These look to be the same type of LDRs that I got from a couple of kits that I have. such as the following kit.
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