<https://hydrocheck.com/shop/hy-lite-series-silent-water-quality-indicator-light-hls-25-kilohm/#product>
<http://schema.org/description>
"Your Hy-Lite resistivity indicator incorporates Auto Temperature Compensation and surface mount technology circuitry for accuracy unequaled by other pure water “quality Lights”."
<https://hydrocheck.com/shop/hy-lite-series-silent-water-quality-indicator-light-hls-25-kilohm/>