US monitoring equipment company Myron L has posted a video on the internet illustrating the working of its Ultrapen PT1 water quality tester package.
The pen can measure conductivity for potassium chloride in μS; total dissolved solids (tds) for natural water in ppm; tds for sodium chloride solutions in ppm; salinity for natural water solutions in ppt; and salinity for sodium chloride solutions in ppt.
The video can be seen on YouTube.