$134.07

Extech RE300 ExStik ORP Meter

$65.57

OMEGA CDH-35 WATER-RESISTANT CONDUCTIVITY METER

$349

Oaktron PC 10 Waterproof Handheld Meter pH/Conductivity/Temperature

$55

HM Digital ORP-200 Waterproof Professional ORP/Temp Meter

$99.95

Oakton ION 700 Benchtop Meter Laboratory Desk Meter LCD No Probe Device Only

$350

Hach DR300 Nitrate NO3-N

$18.99

TDS 3 Meter | Measure Your Waters PPM | For The Clean Garage Spot Free Wash

$145

Handheld Conductivity Tester with Range (0～1999)μs/cm (2.00～199.9)ms/cm in Water

$79.95

Orion Perphect Logr Meter Model 310 PH Meter Laboratory Benchtop Unit Potrable

$84.15

HACH PCB circuit board CF19809-B FS19809-B ASSY 19810

$100

Hydrolab SDI-12 Communications Module - Water Quality Monitor

$99.99

Thermo Scientific Orion Star A111 Benchtop pH/mv/Temp Meter, Lab Instrument