Pinnacle Technology, Inc. offers a glucose biosensor that is capable of providing real-time changes in glucose concentration in the brains of rodents. The glucose biosensor has outstanding performance characteristics and rejects all common electroactive interferents including ascorbate. The glucose biosensor has an average linear range of at least 4 mM. We have successfully demonstrated that the glucose biosensor works in vivo, and can provide continuous monitoring of brain glucose concentration changes for up to four days. This biosensor is warrantied for 21 days from time of shipment.