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 Hexagram Weights

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Description

📊 Stack, weigh, and conquer math like a pro!

STABLE STACKABILITY - Hexagonal shape ensures secure stacking and seamless manipulation
VIBRANT COLOR CODING - Bright, distinct colors for easy identification and engaging learning
CLASSROOM HOME READY - Perfect for Montessori, homeschool, and classroom math explorations
MASTER MASS MEASUREMENT - 54 precision weights from 1g to 20g for hands-on math mastery
AGES 8 ADVANCED LEARNING - Designed to support progression from preschool basics to elementary math skills

The Learning Resources Hexagram Weights set offers 54 durable, color-coded, hexagonal weights designed for ages 8 and up. Compatible with any math scale or balance, this set supports hands-on learning of mass, measurement, and equivalency concepts. Ideal for classrooms and home use, it enhances math skills through interactive, stable stacking and vibrant visual cues.

Specifications

ASIN	B000URFT3G
Age Range Description	8+
Best Sellers Rank	#41,442 in Toys & Games ( See Top 100 in Toys & Games ) #508 in Sorting & Stacking Toys
Brand Name	Learning Resources
Color	Multicolor
Customer Reviews	4.7 out of 5 stars 679 Reviews
Educational Objective	Math
Global Trade Identification Number	00765023042924
Included Components	Weights
Indoor Outdoor Usage	Indoor
Item Dimensions	6.1 x 4.4 x 1.5 inches
Item Highlight	Math Manipulatives for Kids, Teacher Supplies, Back to School, Classroom Must Haves, Set of 54 Pieces, Ages 8+
Item Type Name	Hexagram Weights
Item Weight	0.32 kg
Manufacturer	Learning Resources
Manufacturer Part Number	LER4292
Manufacturer recommended age	8 months - 10 years
Material Type	Plastic
Model Number	LER4292
Number of Packs	1
Number of Players	1 or more
Operation Mode	Manual
Set Name	Hexagram Weights 54-Piece Set
Size	54 Pieces
Supported Battery Types	No batteries required
Theme	Education
UPC	858160441337 885520233547 765023042924
Unit Count	1 Count

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$49