  The low energy muon spin rotation spectroscopy (LE-$\mu$SR) is primarily used
to investigate thin films, surfaces, and interfaces of materials, which has
matured at the Paul Scherrer Institute (PSI) and is routinely employed by users
of the low energy muon (LEM) facility. However, because of the large beam spot
and low implanted muons rate, LE-$\mu$SR measurements on small samples are
difficult, requiring an optimal sample size of $25\times25$ mm$^2$. Recently,
we have boosted our ability to measure small samples, down to $5\times5$ mm$^2$
area, by beam collimation and tuning. This achievement is crucial for the
measurements of many magnetic and superconducting materials. Furthermore, we
have devised a method that allows us to measure five small area samples mounted
together on the same sample plate. We expect this method to further improve the
efficient use of beam time at LEM.
