... testing equipment quick delivery tern Air flow meter (Good quality,low price)Specifications:A,SBL digital flow meter,intelligent ... to measure very low velocity below 0.8m/s.4,No movable part, safe and reliable.5,Wide ... target according to need. 10 ,LCD display.11,4-20mA, 0-10V, impulse, and RS485 outputs.12 ... ~2 years),external power supply of 24VDCOutput forms:4-20mA;pulse,0-10V;RS232/RS485;Hart protocol ...