Blizzow Desk Book Stand Holders for Reading Hands Free, Durable Metal Adjustable Book Stand, Sturdy Lightweight Foldable Portable Bookstand -Cookbook, Recipe, Tablet, Music Book, Documents (White) White electronics3 Our sound meter can read

Our sound meter can read between 30dBA~130dBa

More 4-13" Smart Phones and Tablets

lightweight black aluminum

6inch distance between the side release button and the arm gear for easy operation

the output current can be 15mA around

Blizzow Desk Book Stand Holders for Reading Hands Free, Durable Metal Adjustable Book Stand, Sturdy Lightweight Foldable Portable Bookstand -Cookbook, Recipe, Tablet, Music Book, Documents (White) White electronics3 Our sound meter can readBlizzow Desk Book Stand Holders for Reading Hands Free, Durable Metal Adjustable Book Stand, Sturdy Lightweight Foldable Portable Bookstand Cookbook, Recipe, Tablet, Music Book, Documents (White) Adjustable Metal Reading Rest Tablet Study Room Book Holder Foldable Cookbook Stand Feature: Hands free and no assembly required, make you enjoy learning or working. The reading book holder can be adjusted at multiple angles, to prevent children from myopia.