Batteries for PRO pH/TDS pen or Thirsty Light, 1.4V (pack of 4 batteries)
$6.95
$2.08
1500 ppm Calibration Solution
$7.20
$2.16
pH 4.01 Calibration Solution
$6.04
$1.81
General Hydroponics pH Up
$6.73
$2.02
GreenGro Water Conditioner
$16.75
$5.02
FoxFarm Gringo Rasta pH Up Liquid
$17.95
$5.38
FoxFarm Gringo Rasta pH Down Liquid
Essentials Calibration 4.01
$9.99
$3.00
Essentials pH Up
$5.95
$1.78
Active Aqua Hydroponic pH Test Kit
$5.06
$1.52
Essentials Calibration 7.0
Essentials pH Down
