VIVOSUN PH Meter Digitale PH Tester Pen 0.01 Hoge Nauwkeurigheid Waterkwaliteit Tester met 0-14 PH Meetbereik voor Huishoudelijk Drinken, Zwembad en Aquarium, met ATC, Wit

I bought an older version from vivo sun and was ready measured, this one need to do it with the powder solution

Wasn't great. Didn't register even after calibration.

I have not encountered the need for a battery replacement, indicating the product's high quality. Its construction imparts a premium feel, reminiscent of the top-tier calculators used in school algebra classes. Despite experiencing a few accidental drops, the device has proven durable with no discernible damage. Surprisingly, even the glass bulb has remained intact after these incidents. Additionally, the calibration process was relatively straightforward. The inclusion of three different calibration powders, to be mixed with distilled water for creating the calibration solution, enhances its user-friendly nature. However, a suggestion for improvement would be to include extra sets of calibration packs, as the current provision leaves little room for error, potentially rendering the product unusable in the event of a miscalibration without a backup option.

PH-mètre parfait pour une utilisation de base.Précision relativement exacte.Petites lacunes au niveau du temps de réaction et de la stabilité lors de la lecture dans l'échantillon.Viens avec 3 sachets de tampons pH, non-colorés et qui doivent absolument être utilisé pour la calibration car le point neutre est de 6.89 pour ce pH-mètre.

It does not keep a steady reading, the reading keeps changing by 0.01 during measurement.The pH reading from the standing buffer solution (kept sealed from day to day) is not as accurate as the given pH buffer package. I was a Chemist so I was very careful with cleanliness and use of distilled water all the time for cleaning.