The PHS-29 acidity meter is designed based on the Nernst equation. It consists of a pH electrode and a reference electrode, which generate a potential response to the acidity in the solution. The electrode potential is measured, and the pH value of the solution is calculated based on the Nernst equation; The instrument adopts high input impedance and deep negative feedback circuit to achieve accurate measurement.

Technical indicators:
*Measurement range: pH：0.00pH～14.00pH
MV:- 1999mV～+1999mV
*Measurement accuracy: pH: 0.1pH ± 1 word
MV: 0.2% F · S ± 1 word
*Resolution: pH：0.1pH
MV: 1mV
*Input impedance: ≥ 5×10¹¹Ω
*Display: 3 and a half digit LCD
*Temperature compensation range: 0 ℃~60 ℃
*Zero point potential: 0.0pH
*Dimensions: 64 × 185 × 160 (mm)
*Weight: 600g

Usage conditions:
*Temperature: 0 ℃~40 ℃
*Relative humidity: ≤ 80%
*Power supply: AC 220V ± 22V 50Hz ± 0.5Hz
DC 5V (internal)
*No significant vibration or strong magnetic field interference

Suitable for departments such as healthcare, environmental protection, agriculture and forestry, mining, teaching and research, as well as field operations to determine the pH value of aqueous solutions and measure electrode potential (mV) values.