Water Quality Monitoring Imhoff Cone $240.35 Sludge Judge $585.20 Waterproof pH Tester 10 $316.80 Dissolved Oxygen Test Kit $388.74 Dissolved Oxygen Test Refills (30 Pack) $234.30 Dissolved Oxygen Meter $1,716.00 Septic System Revitaliser 1L $60.50 Septic System Revitaliser 5L $212.30 Turbidity Tube $150.48