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Quick Details

  • Place of Origin: Shandong, China (Mainland)
  • Brand Name: Runjie
  • Model Number: P-4
  • Product name: electrical conductivity meter ph meter
  • Certificate: CE ROHS
  • Accuracy: +/-0.1ph
  • Resolution: 0.1pH
  • Dimension: 155mm*29mm*13mm
  • Calibration: One Points Automatic Calibration
  • Operating temperature: 0---60°C
  • Power Supply: 2*1.5V(AG13)
  • Temperature compensation: 0---60°C
  • Weight: 50g

Packaging & Delivery

Packaging Details Neutral carton package for electrical conductivity meter ph meter
Delivery Time 2-15 days after payment
Product Description

Quick response Digital pH meter Portable pH meter




Measure range:                          0.00—14.00ph

Resolution:                                      0.10ph

Accuracy:                                    +/-0.1ph

Automatic temperature compensation:        0°C--60°C

Power supply:                     2*1.5V( Button cell )

Operating temperature:                       0°C--60°C

Calibration:       manual at two point through trimmers

Dimension:                        155mm*29mm*13mm

Weight:                                           50g



1. Turn on the PH meter

2. Immerse the electrode in PH 6.86 standard buffer solution(under the temperature of 25°C)

3. After digital stabilized, press the "shift" button for 5 seconds, (the instrument comes into the automatic calibration Status ) .Wait until the display digital is 6.86pH ,Then complete PH 6.86 point calibration

4. Clean the electrode with distilled water and dry it with filter paper. Immerse the electrode in pH 4.00 standard buffer solution

5. After digital stabilized, press "shift" button for 5 seconds. Wait until the digital is 4.00 pH.Complete the ph 4.00 point calibration

6 .Clean the electrode with distilled water and wipe clean the spare water.Put the electrode in the PH 9.18 standard solution until the data stable,The data is in the range of allowable error.

7. This instrument calibration work is completed after all the steps.


 Operation steps:

 1.Take off the protective sleeve

 2.Clean the Electrode with distilled water and wipe clean the spare water.

 3.Press the "ON/OFF" button .Switch on the power.

 4.Put the PH meter in the solution .Make sure the electrode  immersed in the solution.

 5. Lightly shake the meter, read the data when the numeric stabilized.The temperate displays at the bottom of the screen .

 6. Press the "ON/OFF" button to shut off  the instrument .

 Clean the electrode, cover the electrode protective sleeve.




 The instrument need recalibrate  in the following condition.

 1.Long time no use or use very long time after calibration

 2.The electrode is used Very frequently.

 3. The testing accuracy requirement is very high.

 4.Do not press the "shift" button long time .Otherwise the meter need recalibrate.



When the display value is fuzzy or  unshown ,it shall check the battery voltage. Lessing than 3 v,it shall promptly replace the battery.

Unscrew  battery cover and replace the battery.  

Pay attention to the polarity of battery.



The instrument  maintains for a year, from the delivery date , guaranteeing due to production and material defects 

If the instrument need to be changed or repaired ( not the artificial damage  or caused by fault using ) ,please mail the manual and the instrument together to our factory .

We will solve all the problem for you .


electrical digital pocket size portable ph meter: CE/ROHS/ISO9001

Packaging & Shipping


Our Services

1. we have good after-sales service . we are online  24 hours  .you can contact us any time  if there has problem .

2. we can supply you picture modification service . our designer can modify picture for you according to your


3.we can print logo on the tds&ec meter for you


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