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 CyprusDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚖️ Elevate your child's math game with colorful precision!

COLOR CODED LEARNING - Bright yellow, green, blue, and red weights make math concepts visually engaging and easy to grasp.
ORGANIZED PORTABLE - Includes a sleek storage box to keep your weights tidy and transportable for learning anywhere.
READY OUT OF THE BOX - No assembly needed—start hands-on learning immediately with a complete 54-piece set.
TRUSTED EDUCATIONAL TOOL - Highly rated by parents and educators alike, boosting confidence in early STEM education.
MASTER MEASUREMENT BASICS - Perfectly calibrated 1g, 5g, 10g, and 20g weights to build foundational numeracy skills.

The Learning Resources Metric Weight Set is a 54-piece, multicoloured educational tool designed for children aged 5 to 9. Featuring precise 1g, 5g, 10g, and 20g weights in vibrant colors, it introduces fundamental weighing and measuring concepts. The set comes complete with a compact storage box, requires no assembly, and is highly rated for enhancing early numeracy skills.

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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