Recalibration liquid for pen pen

[kaym]

Any idea which LFS sells the recalibration liquid for ph pen? And how much?

[uklau]

If you are nearby to Toa Payoh or Millenia Tower, I can help you to calibrate FOC. Single or dual point calibration?

[kaym]

You calibrating using your own calibrating liquid? Or is it just using a technique? If its a skill, i'd love to learn
Single point calibration.

[PeterGwee]

No skill required, just some pH standards (4,7,10) and DI water.

Regards,
Peter Gwee

[kaym]

DI as in battery water eh? Not that cheap to buy distilled water to calibrate each time. I read that distilled water exposed to atmospheric air will have its pH value changed.

[Shadow]

C328 also sell,forgot the price between $5 to $8 per small bottle

[cairocks]

NA sells them too.

[bridge]

I have bought a bottle of pH7.00 buffer from C328.

Yes, this bottle comes with a brand name.

However I realised that there is no expiry date for it.

It should have a expiry date. So remember to look out for the expiry date.

[kaym]

possible to just get ph4 buffer solution for a single point calibration ph pen?
I think most of not all buffer solutions here do not sell with an expiry date unless u wanna pay more for the more 'branded' buffer solutions.