Ph meter, conductivity meter, tds meters, orp meter, pna meter, salt meter,tachometer,hermometer, hygrometer,refractometer, water pump
Water quality testing(monitoring) instrument: ph meter, conductivity meter, tds meters, orp meter; pna meter, salt meter; rotary speed measurement of the machinery manufacturing equipment: many functions tachometer; air quality testing instrument: thermometer, hygrometer; others: refractometer, water pump.