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 54 Piece

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

Help Track order

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820 DH

Duties & taxes included

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Sold byAmazon MoroccoDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚖️ Master measurements with colorful precision!

KID FRIENDLY DESIGN - Safe, lightweight plastic perfect for hands-on learning
SPACE SMART STORAGE - Neatly organized in a durable plastic box for clutter-free use
VIBRANT COLOR CODING - Instantly identify weights with bright, distinct colors
PRECISION IN EVERY GRAM - 54 stackable weights from 1g to 20g for exact measurements
STEM READY EDUCATIONAL TOOL - Boosts color recognition and measurement skills for young learners

The Learning Resources Metric Weight Set includes 54 stackable, color-coded plastic weights ranging from 1g to 20g, housed in a compact storage box. Designed for kids, it supports hands-on learning in measurement and color recognition without batteries or assembly.

Specifications

ASIN	B000URFT3G
Age Range Description	Kid
Battery Types	No batteries required
Best Sellers Rank	#94,204 in Toys & Games ( See Top 100 in Toys & Games ) #2,331 in Science Toys & Kits
Brand	Learning Resources
Colour	Multicolor
Country of Origin	USA
Customer Reviews	4.7 4.7 out of 5 stars (664)
Educational Objective	Color Recognition
Global Trade Identification Number	00765023042924
Is Assembly Required	No
Item Dimensions	15.5 x 11.2 x 3.8 Centimeters
Item Weight	0.32 Kilograms
Manufacturer	Learning Resources
Manufacturer Part Number	LER4292
Material	Plastic
Model Number	LER4292
Number of Players	2-4
Operation Mode	Manual
Size	Medium, Small
UPC	858160441337 885520233547 765023042924
Unit Count	1.00 Count

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