| Specification | R846 | R856 | R856A |
| Temperature Range | -10℃~45℃(±2℃) | -10℃~45℃(±2℃) | -10℃~45℃(±2℃) |
| Air Veiocity Meauring Range | 0.3~45m/s | 0.3~45m/s | 0.3~45m/s |
| Wind volume Range | 0~999900m3/min | 0~999900m3/min | 0~999900m3/min |
| ℃/ F Selection | √ | √ | √ |
| Accuracy of temperature | ±2℃ | ±2℃ | ±2℃ |
| Accuracy of Air Velocity | ±3%±0.1dgt | ±3%±0.1dgt | ±3%±0.1dgt |
| Auto Power Off | √ | √ | √ |
| Air Veiocity Unit | M/s,Ft/min,Knots | M/s,Ft/min,Knots | M/s,Ft/min,Knots |
| km/hr,Mph | km/hr,Mph | km/hr,Mph | |
| Back light | √ | √ | √ |
| Max/Min Air Veiocity Measuring Average And Current Air | √ | √ | √ |
| Veiocity Measuring | √ | √ | √ |
| Resolution | 0.1m/s 0.2℃ | 0.1m/s 0.2℃ | 0.1m/s 0.2℃ |
| Data Hold Function | √ | √ | √ |
| USB transmission | √ | √ | √ |
| IR Thermometer | -50℃~300℃ | ||
| General Characteristics | |||
| Power | 9V Alkaline Battery | ||
| Product Weight | 240g | 280g | 300 |
| Product Size | 175mmx165mmx50mm | ||