What Is The Conditions Of Using Aquarium Water PH Acidity Meter

 the conditions of Using Aquarium Water PH Acidity Meter as below:

(1) the environment temperature (0 ~ 35) ℃;(2) the relative humidity is not more than 80%;(3) measured solution temperature: (5 ~ 60 ℃);(4) power supply: four 5 alkaline battery;(5) no significant vibration;(6) in addition to the earth's magnetic field without  external magnetic field outside interference.