| +/- sign change |
| 3 key memory |
| 4 constant function |
| 4 constants and a sign change key |
| 8 digit |
| 8 digit display |
| 8 digit LCD display |
| Colour: White |
| Dual power |
| Dual-powered solar and 1x LR54 battery (supplied) |
| Durable hard keys |
| Hard keys |
| Large numeric keypad for easy entry |
| Percent |
| Robust calculator for Key Stage 1 and 2 |
| Solar and battery powered |
| Square root |
| The HC133 is also commonly used within primary education and is ideal for teaching basic calculator usage during Key Stages 1 and 2 |
| Three key memory |