Manual hand held refractometer handy and robust manual refractometer for checking your coolant protection and wiping water by way of ethylene and propylene glycol content as well as the acid density of car batteries the measuring result can be read directly and exactly via three measuring scales especially easy and fast application also ideal for regular use in the workshop features propylene glycol 50 to 0 c ethylene glycol 50 c to 0 c battery acid density 110 to 140 kg