The price of a hygrometer can vary depending on the type, brand, features, and accuracy of the device. Analog hygrometers are typically less expensive, ranging from $5 to $20, while digital hygrometers range from $10 to $80 or more depending on the specifications. High-end digital hygrometers with advanced features, such as data logging and wireless connectivity, can be more expensive. Overall, the price of a hygrometer will depend on the individual needs and budgets of the buyer, as well as the intended application for the hygrometer.