YSI Oxygen Conductivity Salinity & Temperature Meter Model 85/25 FT. Not Tested.

Vintage YSI 16239 Conductivity Meter

YSI Yellow Springs Instruments Model 31 Conductivity Bridge Nice Clean Untested

YSI Model 58 Dissolved Oxygen Meter - Free Shipping

Standard Capacitor Calibration Kit for LCR Digital Bridges with BNC Interface

Yellow Springs Instrument Co. YSI Model 33 SCT S-C-T Meter

YSI MODEL 36 CONDUCTANCE RESISTANCE METER NO ACCESSORIES

High Stability Capacitor Calibration Kit for For low Temperature Applications