![](http://www.alamy.com/thumbs/6/A4E2AB1B-6F78-41A2-8B40-217DB8A48C6D/KYHBPN.jpg)
Lab technician adding reagent to sample while measuring pH
Size: 3744px × 5616px
Location: Portland, Maine, USA
Photo credit: © Huntstock / Alamy / Afripics
License: Royalty Free
Model Released: Yes
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