Features Specifications:Battery Acid/Antifreeze/Cleaning Fluid Refractometer  Battery Acid/Antifreeze/Cleaning Fluid Refractometer It is designed for testing for concentration of the battery fluids, antifreeze liquid and cleaning fluids (CF). With the indication of the percentage you may know at which temperature the fluid will be frozen for both propylene glycol(PG) and ethylene glycol(EG). It can also be used for checking the strength of electrolyte solution batteries (BA). RHA-100 and RHA-200 can also measure the concentration of ethylene glycol or propylene glycol in antifreeze liquids.  Model Range Min.Div. Accuracy Remark RHA-100  EG: -84° F-32° F PG: -60° F-32° F BA: 1.100-1.400sg  EG: 5° F PG: 5° F BA: 0.01sg  EG: ±5° F PG: ±5° F BA: ±0.01sg  ATC RHA-200  EG: -60°C-0°C PG: -50°C-0°C BA: 1.100-1.400sg  EG: 5°C PG: 5°C BA: 0.01sg  EG: ±5°C PG: ±5°C BA: ±0.01sg  ATC  RHA-300  EG: -60°F-32°F PG: -50°F-32°F BA: 1.15-1.30sg  EG: 10°F PG: 10°F BA: 0.01sg  EG: ±10°F PG: ±10°F BA: ±0.01sg  ATC RHA-503  EG: -50°C-0°C PG: -50°C-0°C CF: -40°C-0°C BA: 1.100-1.400sg  EG: 5°C PG: 5°C CF: 5°C BA: 0.01sg  EG: ±5°C PG: ±5°C CF: ±5°C BA: ±0.01sg  ATC