Kern Optics ORA 4FB Analog Refractometer for Automotive and Industrial Use (Ethylene Glycol, Propylene Glycol, Battery Acid, AdBlue, Screenwash)

Automotive workshops and industrial maintenance teams rely on the Kern Optics ORA 4FB analog refractometer for quick, on-site fluid checks. This handheld instrument measures ethylene glycol and propylene glycol freezing points, battery acid density, AdBlue concentration, and screenwash protection level without batteries or external power.

Key specifications

• Measurement type: Analog refractometer
• Application areas: Automotive (KFZ), Industrial
• Ethylene glycol range: -50 to 0 °C, resolution 1 °C
• Propylene glycol range: -50 to 0 °C, resolution 1 °C
• Battery acid range: 1.10 to 1.40 kg/l, resolution 0.01 kg/l
• AdBlue (urea) range: 30 to 35 %, resolution 0.2 %
• Screenwash (SRF1) range: -40 to 0 °C, resolution 5 °C
• Automatic temperature compensation (ATC): Yes, 10 to 30 °C
• Calibration: Manual, with distilled water
• Prism material: Optical glass
• Housing material: Chrome-plated aluminum alloy
• Light source: Ambient light (no batteries required)
• Eyepiece: Adjustable focus

Why choose it

The ORA 4FB covers five common workshop fluids in one tool, reducing the need for multiple testers. Its chrome-plated aluminum body withstands daily handling, and automatic temperature compensation ensures reliable readings even when ambient temperatures shift.

Ideal use cases

• Checking coolant concentration in vehicle radiators
• Testing battery electrolyte density during maintenance
• Verifying AdBlue urea content in diesel exhaust systems
• Measuring screenwash freeze protection before winter

Good to know

Calibration is performed manually with distilled water using the included screwdriver. The refractometer operates with ambient light, so no batteries are ever needed. Supplied accessories include a storage box, calibration liquid, pipette, screwdriver, and cleaning cloth.