With a hygrometer you can measure the relative humidity. - Pianocarpet

Instrument Used to Measure Humidity: Classical and Modern Hygrometers

K Type Thermocouple Thermometer Hygrometer, 2 in 1 Smart Sensor AS847 Digital Thermometer Hygrometer Humidity Temperature Meter -10°C~50 °C, K-Type -20°C ~ 1000°C: : Industrial & Scientific

Hanna HI9565 Thermo-Hygrometer with Dewpoint

HUMIDITY METER

MP780117 - Multicomp Pro - Humidity Meter, 0% to 100% Relative Humidity, 5 %

Quality Portable Temperature Humidity Meter

MeterTo Split Digital Hygrometer, 2 in 1 K Type Thermocouple Humidity Gauge, -10°C~50°C, 5% RH~98% RH

Hygrometer

HUMIDITY METER

Pianocarpet small 151 x 32 cm - Pianocarpet - Business

HI95654 Thermo-hygrometer with Dew Point and Calibration Data-Logging Probe - UAB “Hanna Instruments Baltics”

Instrument Used to Measure Humidity: Classical and Modern Hygrometers

K Type Thermocouple Thermometer Hygrometer, 2 in 1 Smart Sensor AS847 Digital Thermometer Hygrometer Humidity Temperature Meter -10°C~50 °C, K-Type -20°C ~ 1000°C: : Industrial & Scientific