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Benchtop Type

T-721 Precise pH/DO Meter

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Precise measurements of pH/DO in fields of biotechnology, aquaculture, power plant and environmental protection, and also more widely used in areas of education and scientific research.

Main Features:

●7 inch colored capacitive screen with high resolution (1024*600) and sensitivity, which can show more parameters, more intuitive and simpler to read data.

●Meet GLP norms, with auto calibration, auto temperature compensation, data storage, USB data export, clock, wireless printing, function setup, smart self-diagnosis and other intelligent functions.

●English and Chinese operating system, humanized design with adjustable screen brightness.

●Built-in big memory can store 1000 sets of test data which can be saved and transferred to USB flash drive and opened with Excel, very easy and convenient for edit.

●DO mode has functions of ATC, auto salinity compensation and auto pressure compensation.

●New structure polarographic DO electrode can measure temperature, salinity and dissolved oxygen simultaneously, equipped with special DO electrode calibration sleeve, only need 3~5 min for polarization.

●Combined diaphragm cap makes it extremely convenient to replace the sensitive membrane just by screwing the new cap to the electrode.

●Auto recognition of standard pH buffer solutions and there are three kinds of standard buffers for option: Europe & USA series, NIST series and China series.

●With standard Bluetooth block and support wireless Bluetooth printing to make operations much easier for users. Optional data transmission to PC and cell phone via wireless Bluetooth.

●IP54 dustproof and waterproof housing

●DO measurement is polarographic and suggested to be used with our magnetic stirrer 600 or other appropriate models chosen by customers.

Specifications :


Measuring range



Input current

Input impedance


Temp Compensation range

(-1.99 ~ 19.99) pH

0.1/0.01 pH

Electrode: ±0.02 pH

≤1×10-12 A

≥1×1012 Ω

±0.02 pH

(0 ~ 100)℃ (auto or manual)


Measuring range(mV/ORP/EH)



-1999.9mV ~ 0 ~ 1999.9mV


±0.05% FS

Dissolved Oxygen

Measuring range



Response time

Residual current

Temp compensation range

Salinity compensation range

Air pressure compensation

Automatic calibration

Electrode type

(0 ~ 20.00) mg/L(ppm)  (0 ~ 200.0)%

0.1/0.01 mg/L(ppm)      1/0.1%

Electrode: ±0.10 mg/L,  Instrument: ±0.40 mg/L

≤30 s (25℃, 90% response

≤0.1 mg/L

(0 ~ 45)℃ (automatic)

(0 ~ 45) ppt (automatic)

(80 ~ 105) kPa (automatic)

Air saturated by water, water saturated by air



Measuring range



-10℃~ 110℃


5~ 60℃: ±0.4℃  Others: ±0.8℃

Other Technical Parameters


Data storage

Storage contents




Communication connectors

Dimensions & Weight


1000 groups

Measurement series number, measuring value, temperature, ATC or MTC state, measuring date and time


Wireless Bluetooth, USB2.0

240 × 170 × 70mm/600g

Working Conditions


Ambient temperature

Ambient humidity

IP grade

5 ~ 35 ℃



Standard configuration:

1. T721 pH/ DO meter                                                                1 unit

2. 201T-M plastic pH/ATC three-in-one composite electrode      1pc

3. 2503-C glass pH composite electrode                                    1pc

4. MP500 temperature electrode                                                1pc

5. DO500 DO electrode                                                              1pc

6. 602 rotary electrode holder                                                     1pc

7. pH standard buffer solution(pH4.00, pH6.86, pH9.18/50ml)    1bottle for each

8. 12V power adapter(instrument use)                                           1pc

9. DO503 membrane cap(for DO electrode)                                  3pcs

10. DO502 DO electrode inner solution(30ml)                                1bottle

11. Cathode polishing paper.                                                           2pcs

12. Instruction manual                                                                     1copy

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