The Draper 97983 AdBlue Tester works in both hot and cold temperatures The Draper 97983 accurately measures the strength of urea concentration in DEF (Diesel Exhaust Fluid)/AdBlue solution. Easy to use AdBlue tester, simply squeeze the bulb of the syphon tube and insert the tube into the DEF / AdBlue solution. Then slowly release the bulb and draw off enough liquid to reach the line marked on the tube. The number of floating discs indicates the urea concentration. Once used wash and flush the tester with water. For testing, at hot or cold temperatures the 740mm extra-long hose is designed for tanks with filler necks. Features: For testing at hot or cold temperatures 740mm extra-long hose designed for tanks with filler necks Accurately measures the strength of urea concentration in DEF (Diesel Exhaust Fluid)/AdBlue Simply squeeze the bulb of the syphon tube and insert the tube into the DEF / AdBlue solution Specifications: Model No: 97983