It came with 15lb instaled spring instead of 25lb mentioned. Now is there any way to find out which one is 25lb and which one is 30lb. Look the same

It's RELLY Easy. Just squeeze the spring, between your fingers, You should, Really easily, fell the difference, in resistance.

Does the tamping base move downward into the basket as pressure is applied, or is it fixed to the leveling guide?

The tamping disc is moving separately and it is suspended by the load spring which is interchangeable. And the leveling guide disc sits on a separate spring which is softer.

ASIN	B0C6HNPYBQ
Amazon Bestseller	#313,008 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #199 in Espresso Hand Tampers
Batteries Included	No
Batteries Required	No
Brand Name	Normcore
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (2,939)
Date First Available	June 10, 2023
Manufacturer	Normcore
Material	Stainless Steel Aluminum
Material Care Instructions	Hand Wash
Model Number	V4
Package Dimensions	13.5 x 9.9 x 8.2 cm
Package Weight	0.49 Kilograms
Size	58mm

Normcore 58mm コーヒータンパー - V4スプリング式タンパー ステンレススチールフラットベース - 15ポンド / 25ポンド / 30ポンド 交換用スプリング - 陽極酸化アルミニウムハンドルとスタンド - 58mm標準バスケットに適合

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Normcore 58mm コーヒータンパー - V4スプリング式タンパーステンレススチールフラットベース - 15ポンド / 25ポンド / 30ポンド交換用スプリング - 陽極酸化アルミニウムハンドルとスタンド - 58mm標準バスケットに適合