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:2.8, System:0.41, Children of user:0.05, Children of system:0.15