$143

Conductivity Meter Tester with Accuracy Electric Meter +1.0%FS Matching +1.5%FS

$210

Industrial Online PH Controller Meter Tester with Range 0~14pH Accuracy ±0.02pH

$440

Benchtop Conductivity Meter TDS Meter with 0.00mg/L～100g/L Conductivity Solution

$325

Myron L meter Ultrapen PT3, ORP Item # PT3

$109.99

Oakton Multi-Parameter PCTestr 35

$143

Digital Conductivity Meter with Accuracy Electric Meter +1.0%FS Matching +1.5%FS

$95.42

SARK100 Portable Antenna Analyzer Meter User-Friendly Operation With High YAUC

$210

Online PH Controller Meter Tester with Range 0–14pH Accuracy ±0.02pH for Sewage

$360

Digital Conductivity Meter TDS Meter with Conductivity Liquid 1 Point Calibrate

$250

IQ scientific instruments IQ150 Dual pH Technology pH/mV/Thermometer

$346.69

Orion 410A pH Meter with New pH Electrode

$19.59

1-Professional Laboratory Electrode Aquarium Hydroponic Laboratory PH YXLS