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Hand holding test tube with pH indicator comparing color to scale

Stock Photo:
Image ID: 65569552
Release Information: N/A
Copyright: Shawn Hempel
Small
500x334 6.9"x4.6" (72dpi) 109 KB
Med
1000x667 3.3"x2.2" (300dpi) 356 KB
Large
3747x2498 12.5"x8.3" (300dpi) 2.7 MB
Super
7494x4996 25.0"x16.7" (300dpi) approx.8.4 MB
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