Level Probes Submersible probes for level and fill measurement. With a special design and cable and housing materials that have been chosen for compatibility with their surroundings, these probes can be used in a wide range of liquids. Standard Level Probes Series 26Y Series 26X Series 36XW Series 36KyX Series 46X Series 36XiW Series 36XS Series 26W Intrinsically Safe Level Probes Series 26Y-Ei Series 36XW-Ei Series 46X-Ei Multi-Parameter Probes Series 36XiW-CTD