Calomel-Free pH and Reference Electrodes offer the high performance levels of calomel electrodes without the hazardous mercury associated with the design. The product is available in a glass body or in virtually unbreakable, chemically resistant thermoplastic. The design features an Ag/AgCl-based double junction reference with a unique silver ion trap that prevents contamination with the silver-sensitive sample. The reference output is adjusted to deliver the same output as Calomel products using a silver chloride reference. The product is available in a combination model featuring a pH measuring cell and reference cell in a single body with separate reference half cells also available. Gel-filled, sealed references are maintenance-free, while refillable designs extend life with a refillable reference electrolyte. Units feature a measurement range of 0-14 pH (0-12.3 pH without Na+ error with a rapid pH response speed of >95% in 1 second). They feature an isopotential point of pH 7.00 (0 mV), an offset of 0.20 pH and a span of 97% or higher. The electrode operates up to a maximum temperature of 140°F (60°C).