Enligt manualen:
Check pH electrode in this way: Fig. The value here is 8.5 ml. 1) Use a new, not opened, bottle of mineral water, NO gas, with labeled pH on it. Here is a few brands that have labeled pH (with good accuracy as water is with high alkalinity): Evian, Aqua d'Or, Gerolsteiner, Volvic, Fiji etc. 2) Rinse electrode in tap water , wipe off carefully, do not touch glass bulb, and then rinse in some of the mineral water you shall use.
Testat själv o det är en bra metod.
En smaksak vilken märke du väljer