Profile: APRS World, LLC specializes in data logging and industrial control equipments. Our ThermokSolar is a solar heating differential temperature controller for PV and DC powered applications. It can be used as a differential temperature controller for solar hot water and solar hot air systems. Our wind data logger records wind speed, gust & direction, time & date, temperature, battery voltage, and other important wind parameters. our data logger records wind speed, wind gust, and average wind speed at one minute intervals.