I am unhappy with the results I am getting with PH tests. I have API and Salifert PH tests and they don't agree, nor are either one very accurate.
Since I have vision problems, color matching to a chart is a real challenge for me.
Can anyone recommend a good, accurate, Digital PH meter. I have looked and prices seem to range from under $20 to over $150.
I can't keep fish alive and I believe it is due to PH since everything else is okay.

In that case I could see wanting one, especially if you deal with values that jump from time to time. I've used the ones from pinpoint. No matter the brand you choose, you'll have to also buy cleaning and calibration fluids to keep it accurate. Not so sure because they are digital they are anymore accurate though.

Hannah Test
American Marine
pH Meters| Hanna Instruments, USA
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With my vision problem, a digital readout will be more helpful than trying to match between colors on a chart that I can't see that well anyway.

I'll check them out.

Most fish are very ph tolerant (not Discus or Salt Water fishes), so long as any change is gradual. The usual reasons for fish loss is dirty water or bad temperature. Remember that meters all require some type of caibfration of their probe, not ph. You could also take a sample of your water to your local fish store and have them test it for you, this would confirm any results you get. They will usually use strips.

My primary problem is with my FOWLR marine tank. My Freshwater fish are doing fine, although a PH meter would help there also. Because of my vision problem I do not have a drivers license so frequent trips to a LFS are not possible since none are within walking distance, and I live in the country where there is no public transportation.