HACHHousing Authority of the City of Houston (Texas)
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Standard solution analyses indicate the HACH spectrophotometer is accurate and not subject to drift.
The HACH equipment used to measure the water samples in the field and in the laboratory are not as sensitive as equipment used by the government agencies who set the standards.
These results are significant given the complex design of extensive watershed hydrology monitoring experiments related to livestock grazing and nonpoint source pollution which often include the use of remotely collected samples and field analysis kits, such as HACH instruments.