HI-98131 GroLine Hydroponic Waterproof Pocket pH/EC/TDS/Temperature Tester £207.00 (exc. VAT) View Product
HI-97752 Calcium and magnesium photometer: Range: Ca: 0 to 400 mg/L, Mg: 0 to 150 mg/L £507.50 (exc. VAT) View Product
HI-981421-02 Groline 24 Hour Hydroponics Monitor for pH, EC/TDS and Temperature for in-line applications £486.00 (exc. VAT) View Product