Fisher Science & Laboratory - Recent Questions, Troubleshooting & Support

The electrode you have is a combination electrode with an integral calomel reference half-cell and built-in temperature probe. Since the temperature reading is good, the temperature probe is okay. It isn't part of the pH circuits anyway. (Your meter uses the temperature to calculate a temperature correction of pH.) Something else is going on with the electrode proper. Its funny behavior suggests to me that it has dried out internally.
pH electrodes don't last forever. How old is this one? If it's an old one, it's probably time to replace it. If it's new and doesn't work, it may be under warranty.
If you shop for a new electrode, get a gel-filled one. And go for one with a silver/silver chloride reference instead of a mercury one -- especially if you are using it on food or other samples that may be consumed. Another consideration about calomel electrodes: they take hours to recover from relatively small temperature changes. Ag/AgCl references aren't as sluggish.
Finally, take care when storing the electrode. It should be stored under humid conditions to keep it from drying out. The best way is to put a small piece of cotton or glass wool soaked with distilled or deionized water inside the plastic end cap. For shorter-term storage, e.g., overnight, you could immerse the tip in pH 7 buffer.

Fisher Science &... | Answered on Nov 22, 2017

You probably have done this, but......try a new and top line USB cable. rj

Fisher... | Answered on Sep 29, 2017

Fisher has a lot of info on there site. Maybe look through some of the guides and wiring diagrams to see if you can figure it out.

I’m happy to assist further over the phone at

Fisher Minute... | Answered on Jan 20, 2016

joystick controller is saying its not connected to plow valves or pump , this happens a lot due to plug corrosion , using a squirt or two of "electric contact cleaner" in both sides of plugs helps with this

Fisher Minute... | Answered on Jan 19, 2016

Fisher needs a good contact loose contact start from the battery and work your way around everywhere theirs a connection

Fisher Minute... | Answered on Dec 29, 2015

Most likely bad motor it's probably seized

Fisher Minute... | Answered on Jan 09, 2015

i have the same problem. How did you fix it?

Fisher Minute... | Answered on Nov 15, 2014

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