| Code | Optional |
| a | IP 8C (0/45°C × 0.2°C) Low Range Thermometer |
| b | IP 9C (40/85°C × 0.2°C) Medium Range Thermometer |
| c | IP 10C (76/122°C × 0.2°C) High Range Thermometer |
| d | Flask Receiver – 50 ml Capacity |
| e | Spare Cup with Valve for Redwood No. 1 |
| f | Spare Cup with Valve for Redwood No. 2 |
| g | Spare Heater for Redwood No. 1 and No. 2 Apparatus |
| h | Spare Ball Valve for Redwood No. 1 and No. 2 Apparatus |
| i | Stop Watch – Electronic Model |
