Ph test. please help

Is Ph up/down kit necessary to grwo autoflower with AG?

the proper pH is necessary in any type of grow. Proper pH levels are a must.

You should browse some threads to gain some knowledge on pH

Ph is essential to grow healthy plants. If grow in hydroponic you must be measures at least once a day or two. I will suggest you to buy a good ph meter for solutions!

Here is a little guide about plant ph control