S-Pro vs TDI Pro
| Quest S-Pro | White's TDI Pro | |
|---|---|---|
| Technology | VLF | PI |
| Frequency | 13 kHz | N/A |
| Frequency Type | — | — |
| Frequency Tech | Single Frequency | Pulse Scan |
| Weight | 1.1 kg | 2.5 kg |
| Price | — | — |
| Best For | Relics, Park, Fields | Gold Prospecting, Deep Relics |
| Waterproof | Yes | Yes |