Electrode Blades for STX4 EVOM™ for TEER, 3 SetsFeatures Includes 3 Sets of STX4 Replacement Electrode Blades. Each set contains 1 Inner and 1 Outer Electrode Blade. To be used with the STX4 Electrode only. Video How to Replace the STX4 Electrode Blades for Use with the EVOM3 and EVOM Manual FAQs Do the STX4 electrode blade tips tend to darken over the period of use or during storage? Yes, it is a normal process. The STX4 electrode tips tend to darken (cosmetic), but the electrode or the electrode
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