<p>This document specifies the following semi-quantitative methods for the assessment of transparency of waters:</p>
<p>a) measurement of visual range using the transparency testing tube (applicable to transparent and slightly cloudy water), see Clause 4;</p>
<p>b) measurement of visual range in the upper water layers using the transparency testing disc (especially applicable to surface, bathing water, waste water and often used in marine monitoring), see 5.1;</p>
<p>c) measurement of visibility by divers in a destined depth, see 5.2.</p>
<p>NOTE The quantitative methods using optical turbidimeters or nephelometers are described in ISO 7027-1.</p>
Registration number (WIID)
69545
Scope
<p>This document specifies the following semi-quantitative methods for the assessment of transparency of waters:</p>
<p>a) measurement of visual range using the transparency testing tube (applicable to transparent and slightly cloudy water), see Clause 4;</p>
<p>b) measurement of visual range in the upper water layers using the transparency testing disc (especially applicable to surface, bathing water, waste water and often used in marine monitoring), see 5.1;</p>
<p>c) measurement of visibility by divers in a destined depth, see 5.2.</p>
<p>NOTE The quantitative methods using optical turbidimeters or nephelometers are described in ISO 7027-1.</p>
