My daughter needs small weights for her 7th grade science fair project, are these appropriate or for small children only?

They are NOT accurate. I have a digital kitchen scale that I have no reason to doubt, and the 1 gram pieces weight under while the 10 and 20 gram pieces are over. Do not expect accuracy for any purpose, including between themselves.

What is the total weight for all combined pieces? I'd like to use these in a ship building activity- are they waterproof too?

There are 54 pcs, totaling 300g. 20-1g, 20-5g, 10-10g, and 4-20g. Yes they are waterproof as they appear to be of a coated resin /plastic composite. Good quality.

Learning Resources Metric Weight Set Multicoloured

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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341 DH

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Sold byAmazon MoroccoDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚖️ Master measurement with color and precision – because numbers should never be boring!

COMPACT PORTABLE - Neatly stores in a dedicated box, perfect for on-the-go tutoring or classroom demos
HANDS ON NUMERACY BOOST - Ideal for interactive maths activities that build real-world weighing skills
PRECISION IN EVERY GRAM - Includes 1g, 5g, 10g, and 20g weights for accurate measurement mastery
VIBRANT VISUAL LEARNING - Multicoloured weights enhance engagement and quick recognition during lessons
TRUSTED EDUCATIONAL TOOL - Highly rated by educators and parents for effective, fun learning experiences

The Learning Resources Metric Weight Set is a 54-piece, multicoloured educational tool designed for children aged 5 to 9. It includes weights of 1g, 5g, 10g, and 20g in vibrant colors, all stored in a compact box for easy portability. Perfect for hands-on maths activities, this set helps develop a practical understanding of mass and measurement, making it a favorite among educators and parents alike.

Specifications

ASIN	B000URFT3G
Age Range Description	5 years to 9 years
Best Sellers Rank	81,884 in Toys & Games ( See Top 100 in Toys & Games ) 1,952 in Toy Building Sets
Brand Name	Learning Resources
Colour	Multicoloured
Country Of Origin	China
Customer Reviews	4.5 4.5 out of 5 stars (674)
Educational Objective	Numeracy
Global Trade Identification Number	00765023042924
Included Components	Learning Resources Metric Weight Set 54-Piece
Indoor Outdoor Usage	Indoor
Is Assembly Required	No
Item Dimensions	15.5 x 11.2 x 3.8 centimetres
Item Highlight	Compare mass and quantities with a weight set for hands-on maths activities, teacher demonstrations and independent learning
Item Type Name	Learning Resources Metric Weight Set 54-Piece
Item Weight	0.32 Kilograms
Manufacturer	Learning Resources Ltd
Manufacturer Part Number	LER4292
Manufacturer recommended age	5 - 9 years
Material Type	Pappe
Model Number	LER4292
Number of Packs	1
Number of Players	1
Operation Mode	Manual
Power Source	Manual
Set Name	Hexagram Weights 54-Piece Set
Size	Small
Supported Battery Types	No batteries required
Theme	Education
UPC	858160441337 885520233547 765023042924

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