A double crystal based moderate-resolution small-angle neutron scattering instrument has been built and commissioned at the guide laboratory of Dhruva reactor, Bhabha Atomic Research Centre, Trombay, India. The instrument consists of a non-dispersive (1,−1) setting of 111 reflections of silicon single crystals with the sample between the two crystals. The neutron wavelength used is 0.312 nm. The accessible range of wave-vector transfer q is found to be 0.003–0.173 nm −1 for a typical experiment with sintered alumina. The instrument is calibrated with respect to the high-resolution ultra-small-angle neutron scattering instrument S18 at Institut Laue-Langevin, Grenoble, France.