Replacement pH electrode for pH-990, pH-217, pH-218, pH/EC-9853, pH-117, pH-118, pH-991, pH-3012, TDS/pH-9851, ORP/pH-999. Widely used to test the the pH of solution/water. 100% 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/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/EC-9853, pH-117, pH-118, pH-991, pH-3012, TDS/pH-9851, ORP/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/43.3in Item Size:.65x25mm/2.56x0.98in () Item Weight:.41.7g/1.47oz Due to different product batches, the appearance , which does not affect the use. Colour:Black Material:Plastic Package Contents: 1 * 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.