Most greenhouse owners purchase a simple thermometer and hygrometer that can be installed inside the greenhouse so they can keep an eye on temperature and relative humidity.
There weren't any high tech gadgets, like a hygrometer, to ensure that batches of wine turned out well.
He also invented the dew-point hygrometer known by his name (Quar.
He also invented an improved form of hygrometer, a description of which, together with accounts of various observations and experiments made by him, was published in the Phil.
He also paid attention to hygrometry and devised a hygrometer in which a cooled metal surface is used for the deposition of moisture.