Check the listing for details. EXTECH PH115 Refillable Electrode,pH 0 to 14,Flat 3VXH4. Condition: New. Listed at 99.99 USD. Refillable Electrode Module, Double, Testing Parameter pH, pH Range 0 to 14, Tip Shape Flat, Operating Temp. Range 32 Degrees to 122 Degrees F, Body Material Polycarbonate, Diameter 16mm, Length 38 mm, Cable Length Not Applicable, Amplifier Not Applicable, Temp. Sensor -5 Degrees to 90 Degrees C, For Use With pH100 and pH110 pH Meters, Standards CE, Shelf Life 12 mo, Junction Single, Electrolyte KCL, Recommended Use Liquids, Semi-Solids, Solids, Includes Cap, Manufacturers Warranty Length 6 mo Extech(R) PH 115 by FLIR EkStik(R) replacement refillable pH electrode module aids in eliminating the problem of limited electrode shelf life, contamination, and usage life. Has built-in Pt-100 Ohm sensor. Can be used interchangeably with ExStick(R) chlorine or ORP meters. Comes with protective conne.