Is there something that does not change its value that can be used to measure currency inflation? Currency is represented as an exchange for something valuable, whether it be an object or work. 

Prices for objects can change over time, depending on demand and supply, making objects unreliable to measure inflation. Most countries use precious metals to measure or establish currencies, but the prices for metals can also change over time. The amount of work it takes someone to complete a task depends on their physical and mental abilities, in which no two humans are the same.

Is there something that does not change its value that can be used to measure currency inflation?
TL;DR -- No

Now for the fun part.  No!  No-no-no-no-no!  And here's why...

Conditions change.  Any commodity you can name will change in value over time, as various things happen:


People stop wanting it (I mean, you can buy myrrh these days, but it's not a hot-ticket item)
The availability changes (New mines show up, or old ones shut down)
People start wanting it (use of gallium really spiked when electronics came along)


But wait!  How about gold?  It's been in demand for like evah, right?  Well.  Let's look at the inflation-adjusted price of gold, just for the last century:



Maybe you could try something like "one day's rations", ie enough food to feed the metric standard guy for one day.  Of course, as agriculture gets more efficient...  Hmm.  The US gov't uses a "standard grocery basket" to measure inflation, that works ... okay, though politics occasionally sneak in.

Anyway.  Short story -- nope.