Replacement pH electrode for pH-990, pH-217, pH-218, pH or EC-9853, pH-117, pH-118, pH-991, pH-3012, TDS or pH-9851, ORP or pH-999. Widely used to test the the pH of solution or water. 100percent new accessory for water quality tester. Great laboratory pH electrode probe. Suitable for most pH meter and controller with BNC-Q9 connector. The electrode is composed by the pH glass electrode and reference electrode. It is the measuring element of pH meter, using to measure the pH of solution or water. Apply in water sources, aquarium, hydroponics, laboratory, spas, swimming pools and other water systems. Type:Laboratory Electrode Model:pH-990, pH-217, pH-218, pH or EC-9853, pH-117, pH-118, pH-991, pH-3012, TDS or pH-9851, ORP or pH-999 Suitable SKU:E1595, E1597, E1598, E1274, E0919, E1135, E1147, E1149, E1150, E1273 Display:Digital Display Probe Type:Sensitive Crystal Ball Bubble Range:0.00-14.00pH Resolution:0.01pH Accuracy:0.1pH Temperature Range: 0-50 (32-122) Type of Electrode Plug:Q9 BNC:Upright Length of pH Electrode Line:. 1.1m or 43.3in Item Size:.65x25mm or 2.56x0.98in () Item Weight:.41.7g or 1.47oz Due to different product batches, the appearance , which does not affect the use. Colour:Black Material:Plastic Package Contents: 1 x pH Electrode Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.