| Id Number | 220 |
| Object Title | Micrologger |
| Manufacturer | Campbell Scientific, Inc. |
| Date of Object | Unknown |
| Model | CR21 |
| Serial Number | 3215 |
| Dimensions | 20.5 x 14.5 x 7 cm; 8'' x 5 3/4'' x 2 3/4'' |
| Material | Metal; Plastic |
| Id Number | 221 |
| Object Title | Portable Potentiometer |
| Manufacturer | Nichols & Roe Elect. Labs. Ltd. |
| Date of Object | Unknown |
| Model | 100 |
| Serial Number | 913-388 |
| Dimensions | 28 x 20.5 x 12 cm; 11'' x 8'' x 4 3/4'' |
| Material | Wood; Plastic; Metal |
| Id Number | 223 |
| Object Title | Micrologger |
| Manufacturer | Campbell Scientific, Inc. |
| Date of Object | Unknown |
| Model | CR21 |
| Serial Number | 1072 |
| Dimensions | 20.5 x 14.5 x 7 cm; 8'' x 5 3/4'' x 2 3/4'' |
| Material | Metal; Plastic |