Nuclear polarisation and Larmor precession frequency rise with increasing magnetic field strength, leading to higher NMR sensitivity. NMR signal detection in weak magnetic fields may seem counterproductive in this context. Internal interactions like J-couplings and dipole-dipole couplings are truncated in high-field NMR. In zero-to-ultra-low-field (ZULF) conditions, internal interactions dominate. As a result, we believe ZULF NMR can complement the data from high-field NMR. By prepolarising the sample in a high field or by using methods such as parahydrogen-induced polarisation, low nuclear spin polarisation can be overcome. Using a pickup coil that relies on electromagnetic induction reduces detection sensitivity in low fields. So, in order to detect NMR signals, we must employ non-inductive approaches. Atomic magnetometers (AM) [1] directly detect the magnetisation of the sample and, hence, have proven to be a better detection technique in ZULF NMR. We have developed an AM with a bandwidth of 24 kHz and a dynamic range close to 20 μT with a sensitivity of 1 pT/√Hz. With this bandwidth, we expect to detect couplings with strengths of a few kHz, like dipole-dipole couplings in zero field. Without an external magnetic field, different orientations of the spin system give signals at the same frequency because they have the same energy eigenvalues, depending only on the internal interactions. We will describe our efforts towards measuring NMR signals in zero field from powdered samples using our AM [2]. We use NMR signals measured by a commercial Quspin AM [3] to calibrate our signal measurement system. This allowed us to detect the J-spectrum of methanol in a zero magnetic field. NMR spectra from water with an external magnetic field ranging from 50 nT to 10 μT were also obtained.