A small, electronic device with micro-needle(s) intended to be inserted percutaneously into interstitial tissue to continuously measure and record interstitial fluid glucose concentrations, typically for detecting trends and tracking patterns in patients with diabetes mellitus. It is typically a thin, flexible, needle electrode that uses electrochemical means to convert glucose levels into an electrical signal. It typically has an adhesive covering that holds it to the skin surface, and transmits the signal via a cable or transmitter. This is a single-patient device intended be used for a period before being discarded.