These glass 'All-in-one' pH/temperature electrodes offer more reliable and stable reading than epoxy versions. Amber glass bulb for low sodium error even in solutions with a pH greater than 12. Double-junction design assures longer life even with dirty or troublesome samples such as TRIS buffer or wastewater. A 2.5 mm mini audio plug combined with a thermistor for automatic temperature compensation input to your Oakton pH meter. Compatible with the following Oakton meters: handheld pH/Ion 5, 6, 11, 110 and benchtop 510, 700, 1100, 2100, and 2700.