A nice ph pen - one with 2 digits after the decimal point - cost like US$25

Don't forget to get a supply of calibration solution when you get the pen

Did you do anything to the soil before you planted the beans, or just dug a hole and stuck them in?

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I put the FU in Fun

Okay, here is an idea for you.

#1. Get a 3 or 4 foot section of black plastic sewer pipe. This will be 12" or greater in diameter.
#2. Dig a hole in the ground 3 or 4 feet deep.
#3. Place the pipe into the hole but keep 5 or 6 inches above the ground level.
#4. Fill the pipe with outrageous quality soil
#5. Transplant your seedling into the pipe.

The black plastic will absorb the heat and keep the roots and such nice and warm.
Vermin will be blocked
You'll have better control of the soil and the moisture.
It's great for early in the year or outdoor planting where the ground is not properly heated.

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I put the FU in Fun

I bought some potting mix filled 4 3" id pots with it put the seeds in them than waited for them to sprout and there growing super slow i finally found foxfarms so im gonna transplant into that

My nice ph pen cost a little over $100, you can use test strips they are only like $5. How often are you watering these seedlings.

I water once the pot has dried out. than i spray them with a sprayer nice green leafs well it has been 8 weeks and they now have there 4th set of true leafs there finally starting to grow fast