Send it back. Order the lower level Apera. $20-$35 i believe. MUCH better. I have one of those thrown in a drawer somewhere
That’s a tds meter. It reads your ppms not ph. If you don’t already have one, keep it. You will need to know the ppms of your nutrient solution and runoffs.
O crap 
Great catch. I still use the cheapy tds. Its solid
Tds/ppm/ec is basically the amount of ‘nutes in ur water’ also something you want to keep track of. Like bobby said, she’s a keeper
I just sent it back , lol , wont the Apera meter Purpngold told me about test the runoff also ??
For ph, yes. But not ppms unless you get aperas combined ph/tds meter.
Apera sells a combined meter 
Its above. But I practically swear by they equipment. Ive dropped my ph meter in the toilet and she is no worse for wear (although i wouldnt advise it)
$ 128.00 is not in my budget , lol , I am in over my head with the contents I have , Yep
Yeah, I was just saying there are tds/ph combo meters. A lot of us just use the tds meter like you had. Haven’t had any issues with it. The ph meter that looks like that tds meter is accurate but needs to be calibrated a lot. So we usually spring a bit more for the ph meter
Yup. $40~ for the pH is a great buy. The $10 ppm meter is solid and reads true. But dont skimp on that pHer. My cheapy SUCKS