I buy the API test kits with the 2 PH test reagents, one for low range and one for high range. Prefer these as they test to the nearest 0.2 PH as opposed to round numbers.

But as my PH is high I never use the low range kit.

Have a brand new kit on order and also have another reagent which is over 10 years past expiry date but still tests perfectly accurately when tested alongside new kits.

So if anyone needs PH test kits for testing PH between 6 and 7.6 let me know and I'll post one to you after the lockdown is over, or when I next go past the post office and its open.