6-in-1 Waterproof pH/ORP/TDS/EC (Conductivity)/Salinity/Temp Meter Pocket Size Multi-Parameter Water Quality Tester Kit Replaceable ORP Probe: Amazon.com: Industrial & Scientific
Myron L TP1 TechPro II DS Meter | Handheld Conductivity, TDS, pH Meter
Amazon.com: 5 in 1 TDS Meter Digital PH Tester, 0.01 High Accuracy PH Meter for Water, PH/TDS/Conductivity/Salinity/Temp Tester, PPM Meter Water Tester for Drinking Water, Hydroponics, Plants, Aquarium and Pool : Industrial
REED Instruments - Conductivity, pH & TDS Meters & Testers; Type: Data Logging Conductivity/TDS/Salinity Meter; Minimum pH Range: 0.00; Probe Type: Single Junction; Maximum pH Range: 0.00; Minimum Ph Range: 0.00; Maximum
6-in-1 Pentype Conductivity Tester Temperature TDS ORP Salinity Water Quality IP57 Design Taiwan Made - AliExpress
HQD® HQ440D General Purposes Water Laboratory pH and Conductivity/TDS Meter Package | Hach
Milwaukee MW804 PRO Waterpoof 4-in-1 pH / Conductivity / TDS Tester with Thermometer and Replaceable Probe