This
Digital pH Monitor Tester Meter Adapter Thermometer also fits my needs being small & mountable, colour matching and furthermore with thermometer which I'll be getting separately anyway but I guess nobody knows how's the quality?
At 1/3 the price of Dymax's should I consider as I'm thinking a pH meter in my small tank is already overkill or small tank pH fluctuates even more thus all the more I need one? I guess if it's reasonably accurate and last at least 1 yr, it would have more than justifies the low price. I don't like the idea of using a pen cos if I do, I would have considered a test kit.