Inkbird Aquarium Dual Stage Temperature Controller + NTC Sensor, AC 100V - AC 240V. (ITC-308S + 1.97" NTC Probe) It is good for beer mashing, fermentation ect. Probe Dimensions: 6mm x 50mm (0.24in x 1.97in); It can be removed easily. It's ONLY compatible with INKBIRD's following controllers: ITC-308,ITC-306T,ITC-310T, ITC-1000. Stainless steel material,