Type 1 Diabetes is a chronic illness in which the body cannot regulate its own blood sugar. Those affected usually wear a device called a continuous glucose monitor (CGM). A CGM is a device that constantly measures the blood sugar of the person wearing it. Laxmi Therapeutic Devices is developing a new type of CGM that is unique because it is painless and affordable, but it needs to be reliable, accurate and repeatable in its measurements. Glucal is an instrument developed to validate the new CGM so that it can be brought to human clinical trials and then to the market. Using proportional pumping and passive mixing, Glucal can generate a continuously variable glucose concentration profile that mimics that of an actual Type 1 Diabetic patient. The system can run for twenty four hours allowing it to completely reproduce the changes in glucose levels that happen in the body daily.  Glucal features a silicone sheet which seals around the CGM’s needle and prevents leaks. This allows it to test a wide variety of CGM form factors; the basic principles of the device can be applied to any bio-sensor that measures the concentration of a specific molecule.