As an essential component of state-of-the-art quantum technologies, fast and efficient quantum measurements are in persistent demand over time. Here, we present a precision measurement scheme for weak signals. We propose a dimensionless pseudo-spin pointer based on weak measurement which effectively converts a continuous measurement into a discrete one. We demonstrate experimentally that a weak perturbation of the parametric distribution's moment can be retrieved efficiently by employing the pointer without measuring the distribution literally. The results show that for signals three to four orders weaker in strength than the area-array camera method, an order of improvement in precision is achieved experimentally. We expect that this method can be effectively loaded into various quantum systems and promote the development of quantum precision measurement or quantum computing.

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• Photonics
• Quantum measurements
• Quantum optics
• Quantum parameter estimation
• Quantum sensing
• Laser systems
• Photon counting
• Weak measurements