HALO2 GroLine Wireless pH Tester for SoilThe HALO2 GroLine Wireless pH Tester (HI9810302) is designed to bring simplicity to pH testing of soil for environmental and agricultural purposes. Supplied with: pH 4. 01 buffer solution, 20 mL sachet (2 pcs.), pH 7. 01 buffer solution, 20 mL sachet (2 pcs.),Cleaning solution for soil deposits, 20 mL sachet (1 pc.), Cleaning solution for humus deposits, 20 mL sachet (1 pc.),Electrode storage solution, 13 mL dropper bottle (1 pc.), Gelled bridge