... advanced testing equipment high reliability and durability Sulfuric acid flow meter (98%) with 4~20mA output formCharacteristics ... impulse, and RS485 outputs.12. Easy installation and maintain.anti-interfere, anti-impurity, anti-acid, corrosion resistant, portability. ... , and RS485 outputs.12,Easy installation and maintain.13,anti-interfere, anti-impurity, anti-acid, corrosion resistant, portability ...