Portable ultrasonic flow meter and thermal energy meter, energy meter, BTU meter, Medium: water/glycol/lubricating oil/diesel/freon/other liquid, Measurement range: 0.1-20 m/s, DN 75 tube measurement accuracy: ± 0.5-2 %, DN 13-75 tube accuracy: ± 3 %, Reproducibility: max. 0.5 %, Process temperature rance: -20-85°C, Power supply type: 5-cell NiMH battery, Operating time: 20 hours, Charging time: 6.5 hrs, Power supply: 9-24 V DC, Adapter voltage: 90-264 V AC, Digital outputs: pulse, Analog outputs: 4-20 mA/0-20 mA/0-16 mA, Data logger data points: 198 k, Data logger recording interval: 5 s - 1 hr, Interfaces: USB, Protection class: IP54, Tube diameter: 13-2,000 mm, Dimensions (W x H x D): 264 x 168 x 50 mm, Display size: 127 x 34 mm