Value for Josephson constant
type: ConstantValue
has unit: HZ-PER-V
informative reference: http://physics.nist.gov/cuu/Constants/bibliography.html
standard uncertainty: 12000000.0
standard uncertainty SN: 1.2E7
value: 483597891000000.0
value SN: 4.83597891E14
website: http://physics.nist.gov/cgi-bin/cuu/Value#mid