Features:
①Automatic identification standard liquid
②Restore to factory settings
③Various display modes
④Several LED back lights
⑤High-low point alarm

Technical parameters:
1. Range of measurement: 0.00～14.00pH or -1999～+1999mV
2. Resolution ratio: 0.01pH or 1mV
3. Grade: 0.05 level
4. Stability: ±0.03pH/24h
5. Adjustable range: zero ±1.50pH，slope 70% ～130%
6. pH standard liquid: 6.86/4.00/9.18   7.00/4.00/10.00
7. Temperature compensation: 0～99.9℃ (automatic or manual)
8. Signal output: 4～20mA(opto-isolator output)
9. Control interface: ON/OFF relay contact
10. Relay load: MAX  220V   AC  5A
11. Relay retardation: 0.01～3.00pH or 0～300mV free adjustment
12. Signal output load: ≤500Ω
13. Signal input impedance: ≥1×1012Ω
14. Working voltage: AC220V±10%  50／60Hz
15. Size: 96×96×115mm
16. Hole size: 92×92mm
17. Weight: 0.8Kg
18. Working condition:
    ① Environment temperature : -5～55℃
    ②Relative air humidity: ≤90%
    ③Without strong magnetic-field interference except earth magnetic field