Nitrite Level In A Compact Tractor Cooling System?

[ray66v]

Anyone know what the target nitrite level in the cooling system of a compact diesel tractor should be?

I think I am looking for 1000-3200 ppm

 

[MFRED]

I always just followed the little decal on the test strip bottle. But it is a good idea to have a number. I usually change it every 2 years anyway, it doesn't hold much.