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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Sold byAmazon FranceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚖️ Elevate your math game with colorful precision!

PORTABLE ORGANIZED - Comes with a sleek storage box to keep your set neat and travel-ready
VIBRANT COLOR CODING - Bright yellow, green, blue, and red weights for quick recognition and engagement
DURABLE LIGHTWEIGHT - High-quality materials ensure long-lasting use without bulk
PERFECT FOR HANDS ON LEARNING - Ideal for teaching mass and measurement concepts to kids aged 5-9
MASTER METRIC WEIGHTS WITH EASE - Includes 1g, 5g, 10g, and 20g weights for precise learning

The Learning Resources Metric Weight Set is a 54-piece, multicoloured educational tool designed to introduce children aged 5 to 9 to fundamental weighing and measuring concepts. Featuring 1g, 5g, 10g, and 20g weights in vibrant colors, it comes with a compact storage box for easy organization and portability. Perfect for hands-on learning, this lightweight and durable set enhances numeracy skills with precision and fun.

Specifications

ASIN	B000URFT3G
Age Range Description	5 years to 9 years
Best Sellers Rank	13,764 in Toys & Games ( See Top 100 in Toys & Games ) 509 in Toy Building Sets
Brand Name	Learning Resources
Colour	Multicoloured
Country Of Origin	China
Customer Reviews	4.5 4.5 out of 5 stars (659)
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 Type Name	Learning Resources Metric Weight Set 54-Piece
Item Weight	0.32 Kilograms
Manufacturer	Learning Resources Ltd
Manufacturer Part Number	LER4292
Material Type	Pappe
Maximum Age Recommendation	108.0
Minimum Age Recommendation	60.0
Model Number	LER4292
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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TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

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