Its for a computer Digital temperature sensor with excellent accuracy over a wide temperature range. The sensor has a G1/4 internal and external thread and can therefore be mounted directly on a CPU cooler or a radiator to save space. For operation, an aquaero 5 or aquaero 6 with firmware version 2100 or newer is additionally required, the sensor is connected to the aquabus connection of the aquaero. The aquaero supports a single Calitemp sensor without additional hardware. Alternatively, a maximum of four Calitemp sensors can be connected to an aquaero via an "aquabus X4". Specified absolute accuracy of the sensor chip used for Calitemp -40 °C to -20 °C: +/- 1 °C -20 °C to -5 °C: +/- 0.5 °C -5 °C to 50 °C: +/- 0.2 °C 50 °C to 100 °C: +/- 0.5 °C 100 °C to 125 °C: +/- 1 °C Resolution: 0.01 °C Technical details Connection thread G1/4 Base body nickel-plated brass Silicone cover ring Height when installed: 16 mm Scope of delivery Calitemp Sensor aquabus connection cable Compatible to aquaero 5 XT/PRO/LT Firmware version 2100 or higher or aquasuite 2018-1 or higher aquaero 6 XT/PRO/LT from firmware version 2100 or aquasuite 2018-1 All aquasuite versions from 2017 require a valid license or activation. A valid license/activation for version 2018 or newer must be available to operate this sensor or can be purchased additionally!