Features
1. Restore factory settings
2 .Dot matrix LCD
3.Chinese display
4.It can display PH/ORP value, temperature compensation, 4~20mA output, and time at the same time
5.Page turning
6.Can record data
7.It has password
8.Error indication
9.Has non-buffer solution calibration
10.Automatic/manual temperature compensation
11.Optoelectronic isolation current output
12.Automatic identification standard liquid
13.Circulating button adjustment procedure
14.Key operation acousto-optic feedback

Technical parameters
1. Range of measurement: pH -4.00~18.00pH
  ORP  -1999~+1999mV
2. Resolution ratio: 0.01 pH; 1mV
3. Precision: ±0.05pH; ±1mV
4. Stability: ≤0.02pH/24h; ≤1mV/24h
5. pH correction range: zero ±1.45 pH  slope ±30%
6. pH standard liquid: 6.86/4.00/9.18 or 7.00/4.01/10.00
7. ORP standard liquid: all standard liquids
8. Control range: 0~14.00pH; -1999~+1999mV
9. Output signal: 4~20mA output
10. Control output mode: ON/OFF relay output connection
11. Working voltage: 220VAC±10%, 50/60Hz
12. Size: 144×144×110 mm
13. Relay load: maximum AC 220V  5A
14. Current output load: maximum allowable load 500Ω
15. Signal input impedance: ≥1×1012Ω
16. Working condition:
① Environment temperature : -5 ~ 55℃
②Relative air humidity: ≤90%
③Without strong magnetic-field interference except earth magnetic field