| Type | HARTRIDGE SMOKEMETER-4 |
| Object of measurement | Smoke |
| Measuring range opacity | 0% - 100% |
| Accuracy | ±2% relative |
| Resolution | 0.1% |
| Smoke length | 0.43 m |
| Ambient Temperature Range | −50 C to + 450 C |
| Warm up time | 10 min. (self-controlled) at 200 C |
| Speed of response time | Within 15 sec. for 90% response |
| Sampling | Directly sampled from tail pipe |
| Power Supply | 100 to 240 V AC/50 HZ 10 - 16 V DC @15 amps |
| Size | 100 mm × 210 mm × 50 mm. |