dmm.js-serial

RS232 API for compatible DMM (Digital Multimeter) and other SCPI-compatible devices

owonb41t

A web-bluetooth interface for the OWON B41T+ multimeter

node-red-contrib-lab

Nodes to interact with laboratory equipment (Multimeter UNI-T UT803, Power Supply Hanmatek HM310P, Electronic Load XY-FZ35)