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| Title | Maker | Date Made | |
| 'Calthorpe' test chart | Calthorpe | c.1963 | View |
| Chart No 8 - for a Turville Infinity Balance | Raphael's Ltd | 1950s? | View |
| Freeman Bichromatic Unit | R. Archer & Sons Ltd | Mid 20th c. | View |
| test chart | Kirk Brothers | Pre 1931 | View |
| Turville Infinity Balance and General Subjective Unit | Raphael's Ltd | 1930s | View |