New Amazon deal - OQTO PH Meter and TDS Meter Combo 0.01 PH High Accuracy Water Quality Tester with 0-14 pH Measurement Range, 3 in 1 TDS EC Temperature Meter with Hold Function{Expires 11/12}[Coupon: 50PH1014](50% off) - $11.99 is available! Please note that this deal may not be available for long, so check out the link to see the currently available price!