HI-96735-11 CalCheck standards for Hardness LR/MR/HR, 0.0 and 150/350/520 pp £280.20 (exc. VAT) View Product
HI-720-11 Calibration Check Set for the HI-720 Calcium Hardness Checker HC £27.00 (exc. VAT) View Product
HI-97741 Total hardness and iron LR: Range Iron: 0.00 to 1.60 mg/L, Total Hardness: 0.00 to 4.70 mg/L £490.50 (exc. VAT) View Product