Extech RF40 Battery Coolant Refractometer

This precision optical instrument should be handled gently; avoid touching the optical surface. Careful use of this instrument will provide years of reliable service. Features: - Automotive coolant refractometer measures the freezing point of coolants plus battery charge condition - Provide accurate and repeatable measurements of % Ethylene Glycol and Propylene Glycol and °F on easy to read scale - Automatic Temperature Compensation - Requires only 2 or 3 drops of solution - The prism and lens with a simple focus adjustment provides repeatable results

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