![](https://nthumb.tpgimages.com/mid2_com_img/1339/30729/TOP29027707.jpg)
Multi-parameter meter measuring the chemical properties of water in the headwaters of the River Doethie, Bryn Deilos, Wales, UK. The water is acidic with a pH of 3.6.
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Creative#:
TOP29027707
Source:
達志影像
Authorization Type:
RM
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Editorial use only