What kind of plastic are they made of...? Want to check reactivity/compatibility.

Typically graduated cylinders if milky white are polypropylene or more likely (copoly polypro) also called polypropylene, a polypropylene/polyethylene of some type so compatible with a wide range of chemicals and autoclavable. The variations or PP and PE are high molecular weight hydrocarbon polyolefins therefore non toxic and non contaminating.

Have the measurement inconsistencies people are commenting on been corrected?

The set I purchased in August 2019 had measurement inconsistencies. The set is excellent for introducing measurement to kids, giving them practice reading different scales, and getting a general idea of amounts. However, they cannot be used for any experiments requiring accuracy to the nearest milliliter. The set is very sturdy, but because it's plastic, a meniscus does not form. It is transparent, but not as clear as glass, which makes it difficult to read unless the liquid is colored.

ASIN	B07KVR8YPQ
Brand	moveland
Brand Name	moveland
Capacity	1000 Milliliters
Color	transparent
Colour	transparent
Customer Reviews	4.6 out of 5 stars 1,122 Reviews
Included Components	4 clear plastic cylinders(10, 25, 50, 100ml) , 5 transparent plastic beakers(50, 100, 250, 500, 1000ml), 5 disposable plastic dropper(3ml) , 1 test tube brush
Item Dimensions	20 x 20 x 11.5 centimeters
Item Type Name	Plastic Graduated Cylinders and Beakers
Item Weight	0.25 Kilograms
Item dimensions L x W x H	20 x 20 x 11.5 centimeters
Item weight	0.25 Kilograms
Manufacturer	moveland
Material	Plastic
Material Type	Plastic
UPC	661708722597
Unit Count	1 Count

moveland Plastic Graduated Cylinders and Beakers with 5 Pipettes, 10ml 25ml 50ml 100ml Cylinders, 50ml 100ml 250ml 500ml 1000ml Beakers, Ideal for DIY and Kids Science Lab

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