Ph meter

Will I be able to measure soil's PH with this one? http://www.ebay.com/itm/PH-009-LCD-Digital-0-14-Pocket-Pen-Type-Aquarium-Pool-Water-Meter-Measure-Tester-/261083295908?pt=LH_DefaultDomain_0&hash=item3cc9c6f0a4
Or is it only for water?

That is for water only and its a china rip off of the Milwaukee ph meter.
http://www.ebay.com/itm/pH-600-Milwaukee-Digital-pH600-0-14-Meter-Tester-Pocket-Pen-w-7-01-Sol-Packet-/370631457004?pt=LH_DefaultDomain_0&hash=item564b5b38ec

can I use this one http://www.ebay.com/itm/3in1-Soil-PH-Tester-Moisture-Light-Meter-Hydroponic-Analyzer-Garden-Plant-Flower-/200766341258?pt=US_Weather_Meters&hash=item2ebe9b408a ? I will be growing just one plant. Can it be in the soil for the whole time because I don't want to damage roots while putting it in and out.

I would spend the extra money and get a good one. Cheep china stuff dosnt work right or last long if it dose. But if you get that don't use the light measurement. Don't see how it will be true. And you don't realy damage that many roots putting probes in the soil. So no don't leave it in the pot.

Don't care about light measurement. all I need is as cheap soil ph meter as possible.

Hardwhere stores carry decent cheep ones. Most under 10 bucks.

What soil are you using? I've never used a soil ph tester before and don't see a reason to. As long as you use good soil made for cannabis and ph your nutrient water than its fine.