Paragraf introduces Graphene Hall Sensor optimised for cryogenic applications Paragraf has introduce the GHS-C Graphene Hall Sensor (GHS), providing what is the industryâs only viable approach to measuring magnetic field strengths of 7 Tesla (T) and above, at temperature extremes below 3 Kelvin (K). According to Paragraf it has entered volume production of the GHS-C, a Graphene based Hall sensor that's been optimised to provide high field measurements while operating at cryogenic temperatures. It achieves this while dissipating virtually no heat. The cryogenic sensor also allows measurements directly in cold bore, removing the need for room temperature inserts, giving quality data and time savings.