There isn't one single instrument that measures all types of gas. The specific instrument you need depends on what you want to measure about the gas. Here are some common instruments and what they measure:

For gas volume:

* Gas meter: Measures the volume of gas flowing through a pipe.

* Burette: A graduated glass tube used to measure the volume of liquid or gas in a chemical reaction.

* Syringe: Can be used to measure small volumes of gas.

For gas pressure:

* Manometer: Measures the pressure difference between two points.

* Pressure gauge: Measures the absolute pressure of a gas.

* Barometer: Measures atmospheric pressure.

For gas composition:

* Gas chromatograph: Separates and identifies different components in a gas mixture.

* Mass spectrometer: Identifies the different molecules present in a gas sample.

* Infrared spectrometer: Measures the absorption of infrared light by a gas sample, which can be used to identify different gases.

* Gas sensor: Detects the presence of specific gases, often for safety purposes.

For other gas properties:

* Thermometer: Measures the temperature of a gas.

* Humidity sensor: Measures the amount of water vapor in a gas.

* Flow meter: Measures the rate of flow of a gas.

Some examples of specific instruments:

* Oxygen analyzer: Measures the concentration of oxygen in a gas mixture.

* Carbon dioxide analyzer: Measures the concentration of carbon dioxide in a gas mixture.

* Smoke detector: Detects the presence of smoke particles in the air.

So, to answer your question accurately, please tell me what you want to measure about the gas, and I can help you find the right instrument.