Azzota Antifreeze & Coolant Refractometer for Battery/Antifreeze/Cleaning Fluid , Without ATC Antifreeze & Coolant Heavy-Duty Portable Refractometer for Battery/Antifreeze/Cleaning Fluid Min.Div. 0.01kg/l, 5%, 5'C Ethylene Glycol: -60'C to 0'C, Propylene Glycol 0-100%, Battery Fluid:1.10-1.40KG/L Without ATC Heavy-Duty Portable Refractometer Sturdy design, made of Aluminum or Copper