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Up to 4 instruments of the same type, every published specification side by side. Rows where the values differ are tinted. A blank cell means the manufacturer does not publish that value.
Comparing 2 handheld sound level meters. Back to the category table.
| Specification | Optimus+ Environmental Sound Level MeterCirrus Research | Optimus+ Industrial Sound Level MeterCirrus Research |
|---|---|---|
| Status | Current | Current |
| Verified on | ||
| Standards and class | ||
| IEC 61672-1 class | Class 1 | Class 1 |
| Standards (differs) | IEC 61672-1:2013 class 1 or class 2, IEC 61260 and ANSI S1.11-2004 (1:1 and 1:3 octave filters), IEC 60651, IEC 60804, ANSI S1.4, ANSI S1.43, DIN 45657 | IEC 61672-1:2013 class 1 or class 2, IEC 61672-1:2002 class 1 or class 2 group X, IEC 60651:2001 type 1 or type 2, IEC 60804:2000 type 1 or type 2, IEC 61252:1993, ANSI S1.4-1983 (R2006), ANSI S1.43-1997 (R2007), ANSI S1.25:1991, IEC 61260:1996 and ANSI S1.11-2004 (octave band models), DIN 45657:2005-03 |
| Pattern approvals (differs) | PTB (class 1), LNE (class 1) | PTB (DIN EN 61672), optional, LNE (IEC 61672), optional, Leq and octave band models |
| Recommended calibration interval (differs) | 12 months | — |
| Measurement | ||
| Channels | 1 | 1 |
| Measurement range (differs) | 20 to 140 dB, single range | 20 to 140 dB, single RMS range |
| Frequency range (differs) | 6.3 Hz to 20 kHz (1:3 octave bands measured; 12.5 Hz to 20 kHz displayed) | 31.5 Hz to 16 kHz (1:1 octave bands, C models) |
| Frequency weightings | A, C, Z | A, C, Z |
| Time weightings | F, S, I | F, S, I |
| Simultaneous weightings | Yes | Yes |
| Parameters (differs) | LXeq, LXYmax, LXYmin, LCpeak, LZpeak, LXE, Ln statistics, Lden, Leq LF (20 to 200 Hz), tonal noise detection (C models) | LXY (X = A, C, Z; Y = F, S, I), LXYmax, LXYmin, LXeq, LCpeak, LZpeak, LApeak, LCeq-LAeq, LXE, LAIeq, LAVG, Dose and estimated dose, NR/NC (C models) |
| Dosimetry (differs) | — | Yes |
| Exchange rates (differs) | — | 3 dB, 4 dB, 5 dB |
| Analysis | ||
| Octave bands (differs) | 1/1 and 1/3 | 1/1 |
| Audio recording | Yes | Yes |
| Logging and data | ||
| Shortest logging interval | 10 ms | 10 ms |
| Memory | 8 GB standard; 32 GB factory option | 8 GB standard; 32 GB factory option |
| Hardware | ||
| Microphone (differs) | class 1: MK:224 1/2" pre-polarised; class 2: MK:216 pre-polarised | class 1: MK:224 or MK:229 1/2" pre-polarised; class 2: MK:216 pre-polarised |
| Detachable preamplifier | Yes | Yes |
| Outdoor microphone kit (differs) | Outdoor Environmental Noise Kit (CK:67x/68x) with MK:172 outdoor microphone | — |
| Display (differs) | high-resolution OLED with ambient light sensor and illuminated keypad | high-resolution colour display with ambient light sensor and illuminated keypad |
| Battery | 4 x AA alkaline or lithium | 4 x AA alkaline or lithium |
| Battery life | 12 h | 12 h |
| External power | 5 to 15 V DC via ZL:171 cable | 5 to 15 V DC via ZL:171 cable |
| Weight | 300 g | 300 g |
| Dimensions (mm) | 283 x 65 x 30 | 283 x 65 x 30 |
| Operating temperature (°C) | -10 to 50 | -10 to 50 |
| Connectivity and software | ||
| Connectivity (differs) | USB type B, Bluetooth Low Energy, AC/DC output, GPS (GPS model) | USB type B, Bluetooth Low Energy, AC/DC output (ZL:174 cable) |
| Remote control (differs) | MyCirrus mobile apps via Bluetooth; remote access via Outdoor Kit modem | MyCirrus mobile apps (iOS, Android) via Bluetooth |
| Software | NoiseTools, MyCirrus app | NoiseTools, MyCirrus app |