Measuring resistances in that range could be kind of tricky, usually the low values are not read all that well and errors creep in. Depends on your multimeter and what errors/confidence it has.
But anyhow that .4 does not sound good. Short the probes together and see the probes resistance if it reads zero. For example if the shorted probes measure 0.2 then have to deduct that from the .4 reading.
On the plus side, if it the 0.4 reading is correct then its seems like a bed that would heat up pretty fast.
But anyhow that .4 does not sound good. Short the probes together and see the probes resistance if it reads zero. For example if the shorted probes measure 0.2 then have to deduct that from the .4 reading.
On the plus side, if it the 0.4 reading is correct then its seems like a bed that would heat up pretty fast.