Comparison of masses
m(p⁺/m(e^-) = 1 836.152 701 +37x10^-6
m(CO⁺)/m(N₂⁺) = 0.999 598 8876 +4xl0^-10

Test of the validity of quantum electrodynamics
— The magnetic dipole moment of the electron
1/2 g(e^-) = 1.001 159 652 188 +4xl0^-12
— Nuclear spin frequencies (Hz)
¹H 1 420 405 751.768 +2xl0^-3
2H 327 384 352.5222 +24xl0^-4

Tests of symmetry properties of fundamental laws
— particle — antiparticle (electron — positron)
|g(e^-)/g(e⁺) - 1| < 2xl0^-12
|m(e^-)/m(e⁺) - 1| < 1x10^-7
— the electric dipole moment of the neutron
< 5xl0^-25 e x cm

Test of the hypothesis of the continental drift Europe-USA, 17+3 mm/year. The value obtained by receiving signals from a pulsar by means of radio telescopes placed at various location on the two continents. The timing of the signals are controlled utilizing hydrogen masers.

Test of Einstein's general theory of relativity with a precision of 7xl0^-5. Hydrogen masers were placed on ground and in an accelerating rocket.

Test of the linearity of quantum mechanics with a precision of 4xl0^-27

Test of the point-charge property of the electron. Radius of the electron <10^-22m

(6. and 7. are still questioned)