The discoveries and development of quantum physics in the early 20th century transformed science and unlocked whole new generations of innovative and commercial technologies. Quantum technologies now carry the promise of enabling the next generation of sensors and detectors which exploit quantum effects. Many quantum technologies will rely upon ultra low temperatures (close to absolute zero) to work. Our user-friendly ultra low temperature environments make this possible. Quantum sensing describes the use of a quantum system, quantum properties or quantum phenomena to perform a measurement of a physical quantity. The field is expected to provide new opportunities especially with regard to high sensitivity and precision in applied physics and other areas of science.