Im just gonna give fair warning, I don't know what you plan on doing with the autos when you switch to flower with the photos, but your autos will suffer greatly from the decreased dli. Ive done this before and my photos turned out great, the auto did ok but it would have been a lot better had I kept the light on at least 18 hours a day.
I have an apera ph60. Its a great pen, replaceable probes are a great feature for when the bulbs life ends. Its reccomend if you use a pen frequently they are replaced once every year. If I were you I'd go for the model that does everything, ph, temp and ec that way you got all your bases covered with one device.