Abstract: A refrigerant monitoring set includes a manometer and at least one transparent disk configured to be detachably mounted on the manometer. The manometer includes a manometer face having a pressure scale thereon, and a housing defining an outer window side and including a window at the outer window side thereof, the manometer face being disposed in the housing such that the pressure scale is visible through the window of the housing. The disk is configured to be detachably mounted on the housing at the outer window side thereof by being pressed onto the housing. The disk further has a temperature scale thereon corresponding to a predetermined refrigerant, and is further rotatable with respect to the housing after it has been mounted thereon for achieving a zero position alignment of the temperature scale on the disk and the pressure scale on the manometer face for correlating the temperature scale to the pressure scale.