Can I Get Exact 110vac in Anyway?

You're half-way there with the inverter. An inverting UPS would do nicely. Any power line events would be smoothed and never noticed.

Are you really sure you need a voltage stabilized 110V supply for a welder? Simple welders and even complex electronic welders have a fairly wide input voltage range they can operate on.

I would simply suggest a relatively inexpensive step down transformer for this particular application along with surge suppression (if the increased voltage is related to voltage spikes rather than a prolonged voltage surge).

Can you supply more information as to why you need such a close tolerance supply (as many countries can not guarantee a less than 10% voltage variance you are asking for)?

It is not a welding machine. Its weighing equipment. Its load cell is very sensitive hence it weighs more or less then its actual target weight due to voltage fluctuation.

Please help.

Where did I get welding machine from?

It is not a welding machine. Its weighing equipment. Its load cell is very sensitive hence it weighs more or less then its actual target weight due to voltage fluctuation.

That's odd as the power supply for the weighing machine should compensate for standard voltage fluctuations. Is it not equipped with a switch mode or linear regulated power supply? I have worked on laboratory and industrial weighing systems and never come across the problem you are describing.

What do the voltage range specifications in the manual say?

Best to find out FIRST if it really is the power supply causing supposed variations in the measured readings before going to the expense of a regulated voltage stabilisation system when it could be something else like a bad load cell connection, load cell wiring screening (interference) issue, or just plain user error (it happens).

Joshi is right, you don't need an inverter unless you need a battery backup to keep it running if the power fails. You only need a CVT. Many UPS systems INCLUDE a CVT in their design, but again, unless you need battery backup, an inverter is way too expensive for this.

A resonant transformer power conditioner stabilizes the AC voltage nicely, and provide quite a bit of cleanup too. I used them widely. There might be a variant with 220 in, 110 out too.

I presume the CVT abbreviation meant Constant Voltage Transformer, and not CVT Constantly Variable Transmission (grin).

suggest you look at the specification of your weigh machine. No utility will provide an exact 230V or 110V etc. There is always a tolerance. If your weigh machine is this susceptible to voltage issues I feel it may have other problems and if you are relying on for accurate weight information. The electronics of the weigh machine will be 24V or something similar. You don't say how large the machine is but it either needs putting into a skip or an engineer check.