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| Title | Maker | Date Made | |
| Bi-chromatic flip test | 1950s? | View | |
| Duochrome Test | Clement Clarke Ltd; Ever-Ready | Mid-late 20th c. | View |
| Freeman bi-chromatic test | Harry Freeman | Mid-late 20th c. | View |
| Freeman bi-chromatic test | Harry Freeman | Mid-late 20th c. | View |
| Freeman Bichromatic Unit | R. Archer & Sons Ltd | Mid 20th c. | View |
| Freeman Binocular Bi-Chromatic Test & case | Raphael's Ltd | 20th c. | View |
| Home-made bi-chromatic test | Mitchell, David W.A. | Mid 20th c. | View |