There are a number of variations within the Optimus/Optimus+ range of sound level meters. If you’re unsure as to what your product code means, this guide should help you out.
Optimus/Optimus+ Yellow – CR:15XX Series
| Model | Instrument Class | Features |
| CR:152A | 2 | No data logging |
| CR:151A | 1 | No data logging |
| CR:152B | 2 | Data logging |
| CR:151B | 1 | Data logging |
Optimus/Optimus+ Red – CR:16XX Series
| Model | Instrument Class | Features |
| CR:162A | 2 | No data logging |
| CR:161A | 1 | No data logging |
| CR:162B | 2 | Data logging |
| CR:161B | 1 | Data logging |
| CR:162C | 2 | Data logging & 1:1 octave bands |
| CR:161C | 1 | Data logging & 1:1 octave bands |
| CR:162D | 2 | Data logging, 1:1 octave bands & on-screen NR/NC curves |
| CR:161D | 1 | Data logging, 1:1 octave bands & on-screen NR/NC curves |
Optimus/Optimus+ Green – CR17XX Series
| Model | Instrument Class | Features |
| CR:1720 | 2 | Audio recording & data logging |
| CR:1710 | 1 | Audio recording & data logging |
| CR:172A | 2 | Audio recording, data logging & 1:1 octave bands |
| CR:171A | 1 | Audio recording, data logging & 1:1 octave bands |
| CR:172B | 2 | Audio recording, data logging, 1:1 octave bands & 1:3 octave bands |
| CR:171B | 1 | Audio recording, data logging, 1:1 octave bands & 1:3 octave bands |
| CR:172C | 2 | Audio recording, data logging, 1:1 octave bands, 1:3 octave bands & tonal noise detection |
| CR:171C | 1 | Audio recording, data logging, 1:1 octave bands, 1:3 octave bands & tonal noise detection |
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