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| MODEL | 821 |
| IIT | Gen2+ |
| Magnification | 1x |
| Resolution ( LP/mm) | 45-57 |
| S/N (dB) | 18-21 |
| MTTF(hrs) | 10,000 |
| FOV(degree) | 42+/-3 |
| Detection distance(M) | 180-220 |
| Graduation cursor | Internal(optional) |
| Diopter range | +5/-5 |
| Lens system | F1.2, 25mm |
| Coating | Multilayer broadband coating |
| Range of focus(M) | 0.25--∞ |
| Auto anti strong light | High sensitivity broadband detection |
| Rollover detection | Solid non-contact automatic detection |
| Dimensions(mm) | 115x69x54(No eyeshade) |
| Material | Aviation aluminum |
| Weight(no battery) | 300g |
| Power supply | 2.6-4.2V |
| Battery type | CR123(A)x1 |
| Battery life(H) |
80 (IR OFF) 40 (IR ON) |
| Operating Temperature (ºC) | -40/+50 |
| Relative Humidity | 5%-98% |
| Environment rating | IP65(IP67 optional) |