simpleSDI was the first product from the spears design laboratories back in 2000. It's been updated continuously and remains the best portable silt density index test tool available.
For everything you ever wanted to know about silt density index measurement, and of course, the best portable silt density index measurement tool visit simplesdi.com

icontrols is more recent project. Launched in 2003, i-controls offers high quality, high performance, RO control systems with features and benefits not found on other controllers. If you're ready to move up from a relay based system, upgrade from another brand or even looking for a lower cost alternative to PLC's without sacrificing flexibility, quality and reliability, check out i-controls.net