Ketotek’s KT99 is a dual‑channel temperature controller for straightforward heating or cooling automation. It uses two NTC 10K waterproof probes and provides two independent, directly powered outputs rated up to 10 A each. The controller supports 12 VDC, 24 VDC, and 110–220 VAC supply options and covers a control range of −50 to 120 °C with 0.1 °C resolution between −9.9 and 99.9 °C. Safeguards include compressor delay start, high/low temperature alarms, temperature calibration, and memory retention after power loss. A 0.5 s refresh rate and 0.1 °C control accuracy enable tight regulation. Typical applications include aquariums, incubators, greenhouses, and equipment enclosures where switching heaters, fans, or small compressor loads is required.