  We present the development, tests and first results of the second generation
Low Layer Scidar (LOLAS-2). This instrument constitutes a strongly improved
version of the prototype Low Layer Scidar, which is aimed at the measurement of
optical turbulence profiles close to the ground, with high altitude-resolution.
The method is based on the Generalised Scidar principle which consists in
taking double-star scintillation images on a defocused pupil plane and
calculating in real time the autocovariance of the scintillation. The main
components are an open-truss 40-cm Ritchey-Chr\'etien telescope, a german-type
equatorial mount, an Electron Multiplying CCD camera and a dedicated
acquisition and real-time data processing software. The new optical design of
LOLAS-2 is significantly simplified compared with the prototype. The
experiments carried out to test the permanence of the image within the useful
zone of the detector and the stability of the telescope focus show that LOLAS-2
can function without the use of the autoguiding and autofocus algorithms that
were developed for the prototype version. Optical turbulence profiles obtained
with the new Low Layer Scidar have the best altitude-resolution ever achieved
with Scidar-like techniques (6.3 m). The simplification of the optical layout
and the improved mechanical properties of the telescope and mount make of
LOLAS-2 a more robust instrument.
