... indicator 2. CE,CQC,ISO9001 3. Measure, display,alarm 4. 4loops of alarms 5. Various dimensions selectable AI-501 Intelligent Digital Temperature ... Gas Level Indicator Suitable for measuring and displaying temperature, pressure, flow, level, humidity ... according to IEC61000-4-5.Operating Ambient : temperature -10~60°C; humidity ≤90%RH Ordering code: ...