Portable pH ORP Conductivity DO Meter


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Portable pH ORP Conductivity DO Meter

       PHME-751 , Equipped with 4 different electrodes,  The meter can self  identified the electrode. 



-Automatic identification of 13 pH standard calibration solutions, three options of standard buffer solutions: Europe and -America series, NIST series and China series.
-Able to set pH measurement modes of high purity water and pure water with ammonia.
-Automatic identification of 8 conductivity standard calibration solutions, two options of standard calibration solutions: Europe and America series and China series.
-Adopt advanced conductivity measurement technology, use conductivity electrode of constant K=1, only need one point, -Calibration and meet the measurement precision requirement of 0.5μS/cm ~ 200 mS/cm.
-Ability to switch among conductivity, TDS, salinity and resistivity. Multinomial calculation for TDS and salinity to ensure the conversion precision of the full scale.
-Conductivity measurement mode has the function of non-linear temperature compensation for high purity water.
-Measurement mode of Dissolved oxygen has the function of automatic temperature compensation, automatic salinity compensation and manual air pressure compensation.
-New polarographic type dissolved oxygen electrode can measure temperature, salinity and dissolved oxygen simultaneously, -Equipped with special dissolved oxygen electode calibration set, polarization only for 3~5 min.
-Meter meets IP57 waterproof rating, equipped with calibration solution and portable case.


Category Product Name Basic features and specifications

Measuring range

(-2.00 ~ 19.99)pH


0.1/0.01 pH


Meter:±0.01pH; Overall: ±0.02pH

Input current

≤2×10-12 A

Input impendance

≥1×1012 Ω


+/-0.01 pH/3h
Temp. compensation range (0 ~ 100)℃(automatic)

Measuring range (mV/ORP/EH)

-1999mV ~ 0 ~ 1999mV




Meter:+/-0.1% FS, Overall: +/-15mV
Conductivity Measuring range
Conductivity: (0.00~19.99(μS/cm (20.0~199.9(μS/cm (200~1999)
μS/cm (2.00~19.99)mS/cm (20.0~199.9)mS/cm TDS:(0 ~ 100)g/L Salinity: (0 ~ 100)ppt Resistivity: (0 ~ 100)MΩ·cm


0.01/0.1/1μS/cm 0.01/0.1 mS/cm
Accuracy Meter:+/-1.0% FS, Overall:+/-1.5% FS

Temp. compensation range

(0 ~ 50)℃(manual)

Electrode constant

0.1 / 1 / 10 cm-1

Benchmark temperature

25℃, 20℃ and 18℃
Dissolved Oxygen

Measuring range

(0 ~ 40.00)mg/L(ppm) (0 ~ 200.0)%


0.1/0.01 mg/L(ppm) 1/0.1 %


Meter:+/-0.10 mg/L, Overall:±0.40 mg/L

Response time

≤30 s(25℃, 90%response)
Residual current ≤0.1 mg/L
Temp. compensation range (0 ~ 45)℃(automatic)
Salinity compensation range (0 ~ 45)ppt(automatic)

Atmospheric pressure compensation range

(66 ~ 200) kPa (manual)

Automatic calibration

Air saturated by water; water saturated by air

Electrode type

Polarogram type
Other Technical Parameters

Data storage

200 groups
Storage content Series number, measuring value measuring unit and temperature,


Two AA batteries (1.5V x2)

Size and weight

meter:(65×120×31)mm/180g; Suitcase: (360×270×76)mm/1.6Kg
Quality and safety certification ISO9001:2000, CE and CMC
Working Condition

Environment temperature

5 ~ 35 ℃(0.01grade)

Environmental humidity


IP rating

IP57 Dustproof and waterproof

1. Model PHME-751 pH/ORP/Conductivity/DO meter 1unit 

2. 201T-S plastic pH/ATC three-in-one combination electrode 1pc

 3. 301Pt-S plastic ORP combination electrode 1pc 

4. 2301-S plastic conductivity electrode 1 

5. DO500 DO electrode 1pc 

6. pH standard buffer solution(pH4.00, pH7.00 and pH10.01/50mL) 1btl/each 

7. 1413μS/cm conductivity standard solution (50mL) 1bottle 

8. DO503 membrane cap (DO electrode use) 1bottle 

9.DO502 DO electrode inner solution (30mL) 2pcs 

10. Cathode polishing paper 1pcs 

11. Screw driver 1pcs 

12. Spare AA batteries 2pcs 

13. Operation manual 1pcs 

14. Carrying case 1pcs 

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Friday 24 June, 2016

This product was added to our catalog on Friday 24 June, 2016.