| Brief Features / Dosimeter | Q500 | Q400 | Q300 | Q200 | Q220P | Q100 | Q50 |
| Sound Level Meter (SPL Display) | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| "A" and "C" Weighting | Yes | Yes | Yes | Yes | Yes | Yes | "A" |
| Slow and Fast Response | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Number of Simultaneous Thresholds | 2 | 2 | 3 | 3 | 3 | 2 | 1 |
| User-Selectable 3,4,5,&6dB Exchange Rate | Yes | Yes | Yes | Yes | Yes | Yes | 3 or 5 |
| Percent Dose | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| "C" Minus "A" Calculation | Yes | Yes | No | No | No | No | No |
| Elapsed Time Logging | Yes | Yes | Yes | No | No | Yes | No |
| Printout Capability | Yes | Yes | Yes | No | Yes | Yes | No |
| Exceedance Levels | Yes | Yes | No | N/A | No | Yes | N/A |
| Rugged Aluminium Housing | Yes | Yes | Yes | Yes | Yes | Yes | ABS |
| Field Replaceable Microphone | Yes | Yes | Yes | Yes | Yes | Yes | No |
| Supported by QuestSuite TMfor Windows | Yes | Yes | Yes | No | No | Yes | No |