Humidity Sensors
| Id Number | 4 |
| Object Title | Barometer; Thermometer; Hygrometer |
| Manufacturer | Airguide Instrument Company, Chicago |
| Date of Object | Unknown |
| Model | Unknown |
| Serial Number | Unknown |
| Dimensions | 24 cm x 12 cm x 5 cm; 9.5'' x 4.75'' x 2'' |
| Material | Plastic; Glass; Metal |
| Id Number | 12 |
| Object Title | Assman Psychrometer |
| Manufacturer | Sato Keiryoki |
| Date of Object | 1987 |
| Model | Unknown |
| Serial Number | Unknown |
| Dimensions | 40.5 cm x 9 cm; 16'' x 3 1/2'' |
| Material | Metal; Plastic; Glass |
| Id Number | 54 |
| Object Title | Hygrometer |
| Manufacturer | Harrison & Co., Montreal |
| Date of Object | Unknown |
| Model | Unknown |
| Serial Number | Unknown |
| Dimensions | 15 cm x 3.5 cm; 6'' x 1 1/2'' |
| Material | Metal; Glass |