The SPC fan speed controller manufactured by SMSCOM is one of the most advanced fan controllers on the hydroponic market. The unit comes wired and ready to use, simply plug in your extraction fan and/or intake fan and you can set your desired temperature and the minimum and maximum speeds of your fans. An external temperature probe on 6 feet of wire controls the unit.
SMSCOM fan speed controllers are good basic units that are just fine for controlling small to medium sized extraction systems. The unit features an integrated temperature probe that controls the fan speed. Another nice feature of these units are that they come fully wired, just plug and play.
The Primair is fan speed controller that is capable of adjusting the speed of both intake and outtake fans. An external temperature probe takes readings and the primair unit adjusts the speed of your fans to maintain the room temperature.
Min-max digital thermometers are a great way to keep track of temperature in your hydroponic gardening. This model features a probe to monitor the temperature of your nutrient water as well.
Digital hygrometers take min-max readings on both temperature and humidity in your hydroponic garden. Also features a temperature alarm feature. Batteries included.
No frills min-max thermometer. These units include a simple mechanism for viewing minimum and maximum temperatures. Highest and lower temperatures are recorded by marker indices which are set by the movements of the two mercury thermometers.