Specially designed for scientific research, medical and industrial testing, this ultra-high sensitivity current amplifier can amplify weak currents of 1 pA (10 ⁻¹ ² A) or even lower levels in real time into measurable voltage signals. It is widely used in fields such as bioelectric detection, electrochemical trace analysis, photoelectric detection, and superconducting material testing. Typical applications: Biophysiology: patch clamp, ion channel current, synaptic signal recording. Electrochemistry: microelectrode, electrochemiluminescence, trace heavy metal detection. Optoelectronic detection: PMT/SiPD dark current measurement, single photon counting front-end amplification. Materials research: superconducting critical current, nanowire electrical transport characteristics.