Trapper
Rocky Mountain...High
A couple veteran growers here had a good recommendation for a middle-class Ph pen...$47 USD (28£ I believe) and can be expected to be around for a little longer than the super cheaps.
Oakton EcoTestr Ph2
http://www.amazon.com/gp/product/B0...pf_rd_t=101&pf_rd_p=1688200322&pf_rd_i=507846
You'll need calibration fluid as well.
Oakton EcoTestr Ph2
http://www.amazon.com/gp/product/B0...pf_rd_t=101&pf_rd_p=1688200322&pf_rd_i=507846
You'll need calibration fluid as well.