VIVOSUN Digital pH Meter, 0.01pH High Accuracy Pen Type pH Tester for Hydroponics, Household Drinking, Pool and Aquarium, UL Certified

Very good piece of kit, excellent delivery.

Works well

Does what it's meant to do BUT they should include MORE than one set of buffers.

La calibration est simple. Par contre, par rapport à une sonde témoin, il est extrêmement lent. Il faut compter presque 10 minutes pour que le pH final soit affiché. Il faut donc le mettre longtemps pour à avoir le bon pH. Après 6 mois et une utilisation par mois, il deconne complètement. Mauvaise qualité

Ph meter is received does not work even after calibration. It does not have vivo sun logo label anywhere as shown in product photo also. Not able to return also. Poor quality

Firstly it's not expensive, it didn't come with buffer solutions and only three of the batteries were functional and loose in the package. Other than those concerns it performs well and is easy to calibrate..... I had ordered extra buffer packs!

Funktioniert gut sogar mit Leitungswasser

Although it may be a little delicate to calibrate upon first time using. Insure solution temperature is ~75 degrees F. Measure out 250 ml distilled water. Insert the meter into a cup pour into another cup until you reach the line on the meter. Turn meter on holding down the calibrate button for 5 seconds then release. Press Cal button one more time. I did not get a display showing "cal" like some of the YT videos. This generates confidence in the meter concerns. However, I had a lab tech at the university check the calibration in a buffer solution of 7.0 and the meter showed 6.97. First pH meter that works and provides accurate results.