The LISST-25X has been discontinued. No support of any kind is available for the LISST-25X.
If you are looking for a low-cost sensor for measuring concentration, have a look at our LISST-ABS.
If you are looking for an instrument for measuring particle size in situ, consider our LISST-200X, LISST-Deep, or LISST-Glider.
If you don’t necessarily require in situ particle size, consider our LISST-Portable|XR or LISST-Horizon.