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Hand holding test tube with pH indicator comparing color to scale

Stock Photo:
Image ID: 64553926
Copyright:
Small
500x334 6.9"x4.6" (72dpi) 151 KB
Med
1000x667 3.3"x2.2" (300dpi) 485 KB
Large
3888x2592 13.0"x8.6" (300dpi) 3.5 MB
Super
7776x5184 25.9"x17.3" (300dpi) approx.10.0 MB
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