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Benchtop Type

S-621 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:

●6.5 inch LCD screen which is intuitive and can show more parameters. Humanized design of operating interface makes operations simpler.

●Omron long lasting and light touch panel can be used more than 100,000 times.

● 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.

●Built-in big memory can store 500 sets of test data which can be saved and transferred to USB flash drive and opened with Excel, very easy and convenient for edit.

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

●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 minutes for polarization.

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

●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.

●Smart judge of electrode status to ensure accurate use for operators.

● IP54 waterproof and dustproof.



Measuring range



Input current

Input impedance


Temp Compensation range

(-2.00 ~ 18.00) pH

0.1/0.01 pH

Electrode: ±0.02

≤2×10-12 A

≥1×1012 Ω

±0.02 pH/3h

(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

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)



Measuring range



0~ 100


5~ 60: ±0.4  Others: ±0.8

Other Parameters


Data storage


Communication interfaces

Dimensions & Weight

500 groups


Wireless Bluetooth, USB2.0

270 × 170 × 70mm/600g

Working Conditions


Ambient temperature

Ambient humidity

IP grade

5 ~ 35



Standard Configuration:

1. S-621 Benchtop pH/DO meter                           1 unit

2. Composite electrode                                          1pc

3. Rotary electrode holder                                     1 pc

5. pH calibration buffer                                           1 set

5. DO500 Dissolved Oxygen Electrode                   1 pc

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

7. DO502 DO electrode inner solution(30mL)         1 bottle

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

9. Instruction manual                                                1 copy

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