There is no instrument for measuring god.
The Holy Spirit is the way to test and know God.
There are no ways to test the Holy Spirit.
There are also no devices that can detect, measure or test the following: angels, demons, jinns, fairies, ghouls and goblins, etc.
In sciences, natural sciences or physical sciences (I am leaving out social sciences, here), evidence are something “physical” that can be observed.
When we talk of observations in sciences, we aren’t just referring to what we can directly see, hear, touch or smell with our sensory perception (eg eyes, ears, nose, etc). We often relied on some sorts of devices, instruments or equipment that can do observations for us, where the limitations of our eyesight, hearing and touch are limited and not enough.
To give you an example, radio waves.
We cannot directly observe radio waves through our eyesight, but we can use devices that can observe them, that can use a antenna and a radio receiver, together, that can measure frequencies and wavelength of radio waves.
Not only that, radio waves or radio signals have many applications, because they popularly can transmit audio or audiovisual through broadcasting stations, that use much more powerful antennas and radio transmitters, while we (consumers) have devices like radio or television that can receive these radio signals, in which we can listen to music or talk show on the radio or watch and listen movies or tv shows that were aired by the broadcasting stations. Other applications for radio waves include mobile phones, or wi-fi networking in computers, and those huge satellite dishes are called radio telescopes that are use to observe distant stars or galaxies or detect other astronomical phenomena, used in radio astronomy.
What instrument or device will you detect, measure and test the Holy Spirit, ElishaElijah?
I don’t think you have any idea what “test” in sciences mean.