A compass is used to find your location in a forest
Whatever Instrument that it turns out to be, my issue is; how do we get to confirm its measurements?
To find your location in a forest, a compass is an essential instrument that can help determine direction based on Earth's magnetic field. Additionally, a GPS device or smartphone with GPS capability can provide precise location coordinates and mapping features. Topographic maps can also be useful for navigation and understanding the terrain. Combining these tools can enhance your ability to orient yourself in the wilderness.
A leveling instrument, such as a level or a theodolite, is commonly used to find a horizontal datum. These instruments help in measuring and establishing a horizontal plane or reference point for a specific location.
This instrument is called pluviometer (a rain gauge). See the link below.
A Triple Beam Balance is used to find the mass of an object.
A violin can be used, but its effectiveness is limited.
Graduated cylinder
Pressure gauges.
radar
A triple beam balence
Graduated cylinder
a GPS