With winter approaching its time to get out my refractometer to measure coolants freezing point.

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Just a droplet placed on the slide is enough for a very clear indication of a fluids specific gravity. Available with scales to measure everything from wine to cat's urine, mines also scaled for battery electrolyte s.g., the most accurate indication of a lead/acid batteries state of charge.

Available through Amazon and eBay for around £20.

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone