SPECIFICATION: Case: Die cast aluminum and independent measuring unit Nominal flow-rate (Qn):2.53/h Maximum flow-rate (Qmax): 43/h Minimum flow-rate (Qmin): 0.025m3/h Total pressure absorption:≤200 Pa Operation pressure range: 0.5-100 kPa Cyclic volume:1.2l/rev. Permissible error: Qmin≤Q<0.1Qmax 3% 0.1Qmax≤Q≤Qmax 1.5% Min. recording reading: 0.2 dm3 Max. recording reading: 99999.999 m3 Operation ambient temperature: -10-+40 Service life: ≥10 years Storage temperature: -20-+50 Central distance: 130 mm Connection thread: M30x2mm (or by customized) Dimension:: H230xW200xD175 mm Weight: 2.10 kg Battery: One 3V Li/Mn(service life≥5 years) or Four AA alkaline Batteries Surface: Polyester powder plastics coating (gray) Note: Index c over of aluminum bezel with glass.