What’s the best Ph pens, PPM meters, slurry test kits?

(Not sure where to post, my apologies if it’s not the correct section.)

So long story short, my father’s asking me to help with his lawn care business, and we have a few problem lawns we need to troubleshoot.

What would you recommend for proper equipment? I’ve heard 50-50 reviews on blue labs equipment, apera I see a couple people recommend. Want to avoid cheap equipment as we are charging for our lawn care, and for that I feel that reliable equipment is a MUST.

Just really want to ask: what has worked best for reliability and longevity for you?
I’m looking for a Ph meter, ppm meter, slurry test kits, and anything else I need that escapes my mind atm.
Thank you in advance for any suggestions
Cheers! -GA-

PS:
(Not really marijuana related, but all the equipment recommended will also be used on my cannabis ladies)

For PH & EC the Blue labs Gardian the best purchase I ever made and this was like 10 years ago still never had to second guess it

2nd the bluelab post.
They're on top in my books.

Blue lab

Buy and use whatever you can afford, because all of them work just fine if you calibrate them before each usage! I have a few blue lab(s), then I have many of those cheap fleabay/amazon ones I paid 3 or4 dollars years ago, and they all work the same if calibrated before being used!

For pH go with Bluelab soil pH pen and for EC go with Hanna HI98331

Blue Lab or apera, the apera ph 60 or 70 has a replaceable tip and a soil specific probe.

Jjgrow420 said:

2nd the bluelab post.
They're on top in my books.

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Link

I have the Apera p20 for ph and it’s solid as hell. I’m on my third cheap tds meter off Amazon. Has anyone noticed the accuracy of the cheap ones goes down if the water temp is below 75 degrees F? Pisses me off so bad cuz I have to mix my nutrients up then add ice to get water temp near 70 degrees and the thing sucks the minute I add the ice in. Makes it difficult to measure runoff.