Formula to count a value within a given range

I am trying to write a formula that must meet (2) criteria and then count the number of values that are:

<500

=500 and <=999 ( this is the formula I cannot write for some reason)

>999

I have been successful at pulling the two criteria but cannot figure out how to add the count in the formula. I set them up and can pull the 500 value and the less then 500 value but not the in between value.

here is what I have to identify anything under <500:

COUNTIFS({Tank Inventory Range 2}, [Column2]19, {Tank Inventory Range 1}, [Column3]19, {Tank Inventory -Planning Range 2}, <500)

[Column2]19- Pulling Active Tanks (Active / Closed)

[Column3]19- Is pulling Air Tanks (Air / Ground)

Thanks in advance for any assistance, its greatly appreciated!!