An important message from AquaMaster Tools: Normally, all Aquamaster P50 Pro and P50 Pro2 models are equipped with a 6-pin connector. This ensures that all electrodes are fully compatible. However, during the very first production run of the P50 Pro2, a small number of meters were mistakenly produced with an 8-pin connector instead of the standard 6-pin. In addition, a very small number of electrodes ( expiry date of November 2027 ) with 8-pin connectors also entered the market. This means that a small portion of products are not compatible with the standard P50 electrodes. Download Connector Compatibility Info Sheet This replaceable electrode is suitable for the P50 Pro pH Temp meter. The electrode is IP67 waterproof when attached onto the meter. Please refer to the User Manual for instructions on how to replace the electrode or check out the how-to video. https://www.youtube.com/watch?v=1H2b_WGXvzA Warranty Checklist