I have heard of non invasive glucometers. Don't know how well they work. Do u need one for rodents? Then I wwould be skeptical. 

Dear Ramesh, please see the following reviews.

• Ciudin A, Hernandez C, Simo R. (2012). Non-invasive methods of glucose measurement: current status and future perspectives. Current Diabetes Reviews 8(1):48-54

[doi: 10.2174/157339912798829197]

• Vashist SK. (2012). Non-invasive glucose monitoring technology in diabetes management: a review. Analytica Chimica Acta 31;750:16-27

[doi: 10.1016/j.aca.2012.03.043]

You may also follow the RG discussion on non-invasive blood glucose monitoring  using near-infrared spectroscopy.

https://www.researchgate.net/post/Is_there_anyone_who_did_a_research_on_a_Non-invasive_blood_glucose_monitoring_system_using_near-infrared_spectroscopy

Dear Ramesh, some times ago you asked this question on non-invasive glucose measurement. But from your side, there were no further answers, questions or comments. Is this project still running? It would be interesting to know whether and how the project is running. Kind regards.

am going to do my project in continuous blood glucose measurement by non invasive optical rechnique by near IR.