KH is a measure of carbonates in your water (i.e. Alkalinity). Your kit is measuring in ppm and most of us go by either dKH or meq/l.

1 meq/l = 2.8 dKH = 50 ppm

So your right at 10dKH or 3.5 meq/l. I try to keep my tanks at 10dKH so I tink your good.

The calcium reading is probably off though. You should verify that kit against another like salifert to see how off it might be.