Author: eduKate Asia

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A massive Primary 5/6 evidence guide to ISO 14001 certification: how to distinguish an organisation’s environmental management system and certified scope from claims that every product is green, impact-free or environmentally superior.

PSLE Science Reality Lab Vol No.425 | “Verified Environmental Product Declaration” — Does That Prove the Product Is Environmentally Better?

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A massive Primary 5/6 evidence guide to verified Environmental Product Declarations: why an EPD is a standardised, independently verified disclosure of life-cycle information, not a badge proving a product is environmentally superior.

PSLE Science Reality Lab Vol No.424 | “N95” — Does 95 Mean It Blocks 95% of Every Airborne Particle in Every Use?

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A massive Primary 5/6 evidence guide to the N95 marking: how to separate a NIOSH particulate filter-class test criterion from a universal guarantee about every particle, contaminant, face fit or real-world use.

PSLE Science Reality Lab Vol No.423 | “4-Tick WELS Washing Machine” — Does Four Ticks Mean It Uses One Quarter as Much Water?

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A massive Primary 5/6 evidence guide to Singapore’s WELS label: why four water-efficiency ticks are a category-specific grade under stated test conditions, not a literal promise that a washing machine uses one quarter as much water in every home.

PSLE Science Reality Lab Vol No.422 | “Sample Rate = 1 Reading/s” — Can the Sensor Track Every One-Second Change?

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A massive Primary 5/6 evidence guide to sensor datasheets: why one reading per second tells you how often values are produced, not how quickly the physical sensor can follow a changing quantity.

PSLE Science Reality Lab Vol No.421 | “Accuracy = ±2% RH at 23°C” — Does That Same Accuracy Claim Apply at Every Temperature?

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