how heavy is the base? will it hold the indicator on a wooden surface, i.e. without the magnetic field?

No , it is Designed to be used on a Metal surface with Magnet switch On

What is the diameter of the gauge’s stem (I need 3/8"=9.5mm diameter for my application)? Can multiple plungers be connected to extend the length?

The diameter of the gauge’s stem is 3/8"=9.5mm. You could add a plunger to extend the length as the contact tips can be changed. However I'm afraid of that would affect the precision. The toltal length for the stem and plunger is 1.9inch=48mm (not included the tip length).

can this be used with a drill press to find the center of round stock? thanks

I use this to set up front and rear axle gears it's used to fined the back lash.

What is the warranty on this product?

The listing does not mention a warranty, however the company states that if you have any problems with it they will respond in 24 hours to help out.

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Description

🛠️ Dial into precision, magnetize your workflow!

MAGNETIC MASTERY - Dual strong magnets with ON/OFF control ensure rock-solid stability on any metal surface.
FINE TUNE CONTROL - Easily adjust positioning with the smooth fine adjustment knob for ultimate precision.
COMPLETE KIT READY - Comes with 22 test tips in a sleek storage case—everything you need to measure like a pro.
VERSATILE MOUNTING - Includes flat and lug back options (1/4", 6.3mm hole) to fit your unique setup.
PRECISION PERFECTED - Achieve pinpoint accuracy with 0.001" resolution for flawless measurements every time.

This professional-grade dial indicator features a 0-1" measuring range with ultra-fine 0.001" resolution, mounted on a robust 9" magnetic base with ON/OFF control. Designed for precision and versatility, it includes a fine adjustment knob, dual magnet surfaces, flat and lug back mounting options, plus 22 test tips in a convenient storage case—perfect for engineers and quality control pros demanding accuracy and reliability.