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The water gauge glass is the correct tool for checking the water level in a boiler because it provides a clear and direct visual indication of the water level inside the boiler. The gauge glass is a transparent tube connected to the boiler, allowing operators to see whether the water is at a safe operating level. This is crucial for the safe operation of the boiler, as maintaining the proper water level helps prevent overheating and damage to the boiler components.

Using a pressure gauge would only indicate the pressure inside the boiler, not the water level. A thermostat measures temperature, which does not provide information about the water level. A flow meter measures the flow rate of water but does not indicate the static level of water in the boiler. Therefore, the water gauge glass is specifically designed for monitoring the water level, making it the most appropriate choice for this task.