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Hand holding test tube with pH indicator comparing color to scale

Stock Photo:
Image ID: 64553935
Release Information: N/A
Copyright: Shawn Hempel
Small
334x500 4.6"x6.9" (72dpi) 132 KB
Med
667x1000 2.2"x3.3" (300dpi) 457 KB
Large
2508x3762 8.4"x12.5" (300dpi) 3.3 MB
Super
5016x7524 16.7"x25.1" (300dpi) approx.11.0 MB
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