pH meter, dissolved oxygen meter
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I have questions regarding pH meters and dissolved oxygen meters: among those who have experience in sewage treatment, which American brands are considered the best for these devices?
The quality of HACH from the United States is good. Angjie**si’s is also good. There are many brands, but few have been used; even fewer have been used repeatedly. You should search online and look for discussions related to their use – you might find some unexpected results.