Hanna Instruments HI 9813-6N Waterproof pH/EC/TDS Temperature Meter Clean and Calibration Check for Growers, 0 to 50 Degree C, 9V Battery: Amazon.com: Industrial & Scientific
$170.00 Hanna HI 98129 pH EC TDS Conductivity Tester Meter, HI98129 – NISupply
Hanna Instruments HI9811-51 pH/EC/TDS/Temperature meter with HI1285-51 electrode; EC range: 0 to 6000 microsecond/cm, TDS range: 0 to 3000 ppm (mg/L) | Hanna Instruments - Certified Material Testing Products
Hanna HI991301 Portable Waterproof pH/EC/TDS and Temperature Meter, High Range
Hanna GroLine Combo pH/EC Meter | HTG Supply
Combo Meter (pH+EC) Grocheck Hanna (HI981405N)
Used Hanna HI 991300 Waterproof pH-EC-TDS Meter with Probe and Case for Sale at Chemistry RG Cons...
Hanna Portable pH/EC/TDS/Temperature Meter Low Range EC & TDS - HI991300