I have a camper top made of composite panels on a square aluminum tube frame. Can I use this as a 'stud finder' to locate the frame tube?

I doubt it. It's not a metal detector. It determines the thickness of various materials.

Does it read in US units?

Yes it does both metric and us units

dose it test copper coat thickness over steel ?

Dear, The thickness of the metal itself can be measured but the thickness of the coating cannot be measured. You can find the B07X3SS79N for test copper coat thickness. Digital Ultrasonic Thickness Gauge Meter Scope of application:metal, plastic, ceramic, glass and any other good conductors of ultrasonic waves, as long as there are two parallel surfaces, the thickness can be measured with this instrument, such as aluminum, copper, gold, resin, water, glycerin, etc. "

Display Size	146 Millimeters
Color Name	ブラック
Batteries Included	Yes
Batteries Required	Yes
Brand	CAMWAY
Manufacturer	CAMWAY
Item Model Number	CAMWT167USV
Included Components	CAMWAYの厚さゲージ。
Special Features	超音波厚さ計
Product Dimensions	14.58 x 6.5 x 3 cm; 136.08 g
Item Weight	136 g

CAMWAY デジタル超音波厚さゲージメーター キャリブレーション付き 高解像度データストレージバックライトLCD、厚さ計 スチールメタル厚さテスター スチールアルミニウムメタル銅プレート用

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CAMWAY デジタル超音波厚さゲージメーターキャリブレーション付き高解像度データストレージバックライトLCD、厚さ計スチールメタル厚さテスタースチールアルミニウムメタル銅プレート用