For determining the concentration of liquids, optical method, aluminum material, recalibration possible. For checking the acidity of battery fluid, the concentration of antifreeze and AdBlue additives. Also applicable for coolant and washer fluid. Adjustable eyepiece with rubber eyecup, automatic temperature compensation (ATC) and measured value correction function using bi-metal. Can also be used at ambient temperatures below 10 °C. Includes calibration screwdriver and pipette. Technical data: Battery acid: acid density (measuring range 1.1 to 1.3 kg/l), for AdBlue additives: urea content (measuring range 30% - 35%), coolant Ethylene: temperature resistance (measuring range -25° to -50° C), coolant Propylene: temperature resistance (measuring range -25° to -50° C), windshield washer fluid: antifreeze (measuring range -10° to -40° C), weight: 480 g, total length: 160 mm, diameter: 40 mm, glass surface: 40 x 13 mm Application control Display analog Item type Design Refractometer Main color black Secondary color silver