• HM Digital AP-1 AquaPro Water Quality Total Dissolved Solids Tester, 0-5000 ppm TDS Range, 1 ppm Resolution, +/- 2% Readout Accuracy (Magnetic Body)

  • Aquarium Systems Full Range Hydrometer - TK-504/TK-502

  • HORIBA 3200366539 Model 9615-10D Standard ToupH electrode, 0-14 pH Range

  • HM Digital ZT-2 Basic TDS Tester, 0-999 ppm Measurement Range , 1 ppm Resolution, +/- 3% Readout Accuracy

  • Photometer Low Range Phosphate Reagent