BALRAMA Wet and Dry Bulb Hygrometer -20° to 50°C Psychrometer by ZEAL England Zeal Wet and Dry Bulb Hygrometer / Psychrometer Mason's Type by ZEAL England P501 C+F PSYCHROMETER -20° to 50°C
Taylor - Wet / Dry Hygrometer #HYG
Measuring Relative Humidity with a Wet & Dry Bulb Hygrometer" by Radical TechArt - YouTube
IMPA 370251 WET & DRY BULB HYGROMETER PLASTIC CASE -10/+50 C