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.

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⚖️ Elevate your math game with colorful precision!

NO FUSS NO BATTERIES - Ready to use out of the box—pure tactile learning, zero distractions
PERFECT STEM COMPANION - Designed for ages 8+, ideal for building foundational numeracy skills
COMPACT ORGANIZED STORAGE - Includes a sleek storage tray to keep your set neat and ready
COLOR CODED FOR INSTANT RECOGNITION - Bright yellow, green, blue, and red weights to simplify measurement concepts
MASTER METRIC WEIGHTS WITH PRECISION - 54 weights ranging from 1g to 20g for hands-on learning

The Learning Resources Metric Weight Set is a vibrant, 54-piece collection of precision weights (1g, 5g, 10g, 20g) designed to introduce children aged 8+ to fundamental weighing and measuring concepts. Each weight is color-coded for easy identification and stored neatly in a compact tray, making it an essential hands-on tool for developing numeracy skills without any batteries or assembly.

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S$38

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Product Dimensions	15.49 x 11.18 x 3.81 cm; 320 g
Manufacturer recommended age	8 - 12 years
Item model number	LER4292
Educational Objective(s)	Numeracy
Language:	English
Number of Game Players	1
Number of pieces	54
Assembly Required	No
Batteries Required?	No
Batteries included?	No
tech_spec_battery_description_toys	No batteries required
Material Type(s)	Pappe
Remote Control Included?	No
Colour	Multicoloured
Release date	20 April 2010
ASIN	B000URFT3G

Learning ResourcesMetric Weight Set, multicoloured

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