Water Quality Monitoring Imhoff Cone $103.84 Sludge Judge $468.49 Waterproof pH Tester 10 $212.85 Waterproof Portable C401 Colorimeter $1,106.42 Dissolved Oxygen Test Kit $263.56 Dissolved Oxygen Test Refills (30 Pack) $132.88 Dissolved Oxygen Meter $1,596.32 Septic System Revitaliser 1L $58.19 Septic System Revitaliser 5L $209.77 Turbidity Tube $150.48