Greenlight 300 uses the principle of conventional mercury sphygmomanometer without containing mercury, which is the first non-automated mercury-free blood pressure measurement device; this ensures the accuracy (better than the general electronic sphygmomanometer) and security. This is recommended by the British Hypertension Society (BHS).
The M-250 is a Class III Approved medical chair scale with a lifting seat. Testing found that it reduces the effort required to lift a patient out of the chair by 70%.