Inter Solar Systems [P] Ltd. Manufactures Surveillance Periscope with Protective Shielding. Inter Solar Systems [P] Ltd. Is an ISO 9001:2000 certified company. Inter Solar Systems [P] Ltd. Supplies ISI marked solar energy products. Surveillance Periscope with Protective Shielding is used to search hidden explosives beneath cars, trucks, jeeps. Surveillance Periscope with Protective Shielding is used by Defense forces for surveillance purposes. It is powered by solar energy. These are highly efficient and have high operating range and can be operated in extremely difficult conditions.