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

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

Relative Humidity Meter PCE-HT 114-ICA Incl. ISO Calibration Certificate

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

HUMIDITY METER

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

Hygro-Thermometer Pen with Dew Point and Wetbulb - (RHT05) — Triplett Test Equipment & Tools

PLAFOPE 7pcs Round -Hygrometer Reptile Tank Mini Terrarium Turtle Tank Mini Humidity Monitor Outdoor Digital Thermometer Bearded Dragon Accessories Plastic Amphibious Pressure Gauge : Appliances

Measure humidity with a hygrometer

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

M0198873 Thermo-Hygrometer Relative Humidity Temperature Meter RH Tester – Gain Express Wholesale Deals

Instrument Used to Measure Humidity: Classical and Modern Hygrometers

Relative Humidity Meter PCE-HT 114-ICA Incl. ISO Calibration Certificate