Force brand, original from Taiwan, professional tools. 
Force precision refractometer is suitable for measuring anti-freeze strength, battery fluids, cleaning fluids and Adblue. Supplied with calibration screwdriver, pipette and storage case.
Measuring Range:

• Antifreeze coolant -50 - 0°C for Ethylene Glycol, Propylene Glycol and G11, G12, G13 coolants for VAG (Audi, Porsche, Seat, Skoda, Volkswagen)
• Adblue 30 - 40 % (also Urea & DEF)
• Battery Fluids 1.100 - 1.400 sg
• Cleaning Fluids -40 - 0°C

Operation is simple. Simply apply a small amount of the test sample on the prism surface, close the flap, wait 5-10 seconds for temperature stabilisation and then by viewing through the eyepiece, take the reading at the point where the “borderline” crosses the relevant scale.