$790

1pcs E+H CPS71D-7TP2G electrodes

$240.34

Benchtop Conductivity Meter with 1 Point Calibration ±1.5%FS 0.00μS/cm～100mS/cm

$19.06

Professional Laboratory Electrode Aquarium Hydroponic Laboratory PH DQQS

$980

Nitrate Ion Meter with Standard Solution Range ±1999.9mV 2-5 Points Calibration

$50.41

52-730-005-0, Etching Pen for Metal

$143.32

Pen Type Pocket Conductivity Tester Temp Meter Measurment with Accuracy 1% F.S.

$200

OPTEK C200

$13.23

Radiometer Copenhagen Calomel Reference Electrode K4040

$460.23

One New HACH PC1R1A PH Electrode

$600

1pcs Mettler Toledo InPro3100i/SG/120 52003515 PH Electrode

$60

NUPRO VALVE 6LV-DAVR-PX 9 21 4f

$980

Fluoride Ion Meter with Standard Solution 2-5 Point Calibration Range ±1999.9mV