BQLSX is a DC/AC input measurement module for the UDM35 modular digital panel meter, providing single-channel current and voltage measurements with selectable full-scale ranges of 0.2mA, 2mA, 20mA for current and 0.2V, 2V, 20V for voltage. The module delivers 0.1% basic accuracy with TRMS AC measurement capability for distorted sine waves, featuring a sampling rate of 500 samples/s at 50 Hz and display refresh time of 200 ms. It supports both DC and AC measurements with temperature drift of ±150 ppm/°C and operates with direct coupling. The BQLSX module integrates seamlessly into the UDM35 instrument's modular architecture, enabling precise current and voltage monitoring in industrial control, power monitoring, and instrumentation applications.