wtlam wrote: 我剛剛買左個ph meter, 想問下的PH 液可以用幾多次呢 仲有, 我用tester 時ph有8.1, 但個meter就只得7.8, 點解?
[Processing Time] User:61.52, System:7.47, Children of user:1.08, Children of system:2.56