Perfect Prime CO2000 - Humidity Specifications; Operating and Storage Conditions; Battery Replacement and Notes; Battery Replacement Procedure

7
- Humidity
o Range : 0.1 ~ 99.9%
o Resolution : 0.1 %
o Accuracy : ± 3% (10 ~ 90%)
- Operating Condition : 0 ~ 50°C, 0-95% RH (without
condensation)
o Storage Temperature : 0 ~ 70°C
VIII. Battery Replacement and Notes
Battery Replacement :
The battery is nearly empty when:
-->LCD is dimmed
-->The CO2 reading is zero
Please replace the AA X 4 batteries or use AC power adapter.