1. Range: 200mT (2000Gs) ,2000mT (20000Gs) 2. Graduation value: 0.01mT (0.1G) ,0.1mT (1G) 3. Power supply: 1 9V battery ( Not include batteries ) 4. Working environment: 0℃～50℃, 20%～85%R·H, no condensation 5. Storage environment: -20℃～70℃, <85%R·H, no condensation 6. Instrument size: 160mm×75mm×34mm 7. Instrument weight: about 200 grams 8. Hall probe: standard radial Hall probe, the wire is about 1 meter long 9. Sensor length: 15cm