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.

Hexagram Weights | Desertcart Nicaragua

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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C$1822

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Sold byAmazon NicaraguaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚖️ Stack, measure, and conquer math like a pro!

DESIGNED FOR AGES 8 - Supports advanced math skills from elementary to beyond
MASTER MASS MEASUREMENT - Precision weights from 1g to 20g for hands-on learning
STACK STORE WITH EASE - Hexagonal shape ensures stable stacking and compact storage
CLASSROOM READY DURABILITY - Built tough for daily use in busy learning environments
VIBRANT COLOR CODED SYSTEM - Easily distinguish weights for quick, intuitive math play

The Learning Resources Hexagram Weights set includes 54 durable, color-coded hexagonal pieces ranging from 1g to 20g. Designed for ages 8 and up, these stackable weights enhance hands-on math learning by supporting precise mass measurement with any balance scale. Perfect for classrooms and home use, this set fosters advanced math skills through engaging, tactile exploration.

Specifications

ASIN	B000URFT3G
Age Range Description	8+
Best Sellers Rank	#38,858 in Toys & Games ( See Top 100 in Toys & Games ) #518 in Sorting & Stacking Toys
Brand Name	Learning Resources
Color	Multicolor
Customer Reviews	4.7 4.7 out of 5 stars (670)
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 Type Name	Hexagram Weights
Item Weight	0.32 kg
Manufacturer	Learning Resources
Manufacturer Maximum Age (MONTHS)	120
Manufacturer Minimum Age (MONTHS)	8
Manufacturer Part Number	LER4292
Material Type	Plastic
Model Number	LER4292
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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