i have these 2 ph meters, one is 1 year old the other 3 years old.
they're both giving error when trying to calibrate, they were stored dry, as the instructions don't say anything about storage solutions.
on the instruction it says if they dry out to immerse them in distilled water for 2-3 h, i did so overnight and they're still giving error, i'm gonna try immersing them for 12h in the 4ph solution as i've read it can help revive them.
i will post a pic of the instructions and the ph meters.
does anyone have experience with these cheap meters? how accurate are they? and how often do you calibrate them? as long as the margin of error isn't higher than 0.25 they're good enough for me as i can't afford the expensive ones
they're both giving error when trying to calibrate, they were stored dry, as the instructions don't say anything about storage solutions.
on the instruction it says if they dry out to immerse them in distilled water for 2-3 h, i did so overnight and they're still giving error, i'm gonna try immersing them for 12h in the 4ph solution as i've read it can help revive them.
i will post a pic of the instructions and the ph meters.
does anyone have experience with these cheap meters? how accurate are they? and how often do you calibrate them? as long as the margin of error isn't higher than 0.25 they're good enough for me as i can't afford the expensive ones