  Indian Centre for Space Physics is engaged in studying terrestrial and
extra-terrestrial high energy phenomena from meteorological balloon borne
platforms. A complete payload system with such balloons is at the most about
five kilograms of weight. One has to adopt innovative and optimal design for
various components of the experiment, so that the data can be procured at
decent heights of ~ 35-42 km and at the same time, some scientific goals are
achieved. In this paper, we mainly describe the instruments in detail and
present their test and calibration results. We discuss, how we implemented and
tested three major instruments, namely, a Geiger-M\"uller counter, a single
crystal scintillator detector and a phoswich type scintillator detector for our
missions. We also present some flight data of a few missions to demonstrate the
capability of such experiments.
