Water Quality Monitoring Imhoff Cone $272.33 Sludge Judge $822.80 Waterproof pH Tester 10 $384.54 Dissolved Oxygen Test Kit $400.40 Dissolved Oxygen Test Refills (30 Pack) $241.33 Dissolved Oxygen Meter $2,466.46 Septic System Revitaliser 1L $69.55 Septic System Revitaliser 5L $250.98 Turbidity Tube $210.06