gravity meter

In 1986, as a result of a detailed reanalysis of E¨otv¨os’ original data, Fischbach et al. suggested the existence of a fifth force of nature, with a strength of about a percent that of gravity, but with a range (as defined by the range λ of a Yukawa potential, e−r/λ/r) of a few hundred meters.
The Confrontation between General Relativity and Experiment

The pressure-sensitive wings of strong lines, such as the Mg ib triplet (Blackwell & Willis 1977) is a good gravity-meter with the caveat of potential systematic errors due to non-LTE and 3D effects, which have not yet been fully assessed.
Uncertainties in stellar abundance analyses

In 1986, as a result of a detailed reanalysis of E¨otv¨os’ original data, Fischbach et al. [109] suggested the existence of a fifth force of nature, with a strength of about a percent that of gravity, but with a range (as defined by the range λ of a Yukawa potential, e−r/λ/r) of a few hundred meters.
The Confrontation between General Relativity and Experiment

Terrestrial ones are limited to 15-44 meters (It’s hard work fighting gravity), but larger mirrors could be supported on the moon.
Astrophysics in 2006