got a new meter but it still needs to be cal'd.. it came out of the box reading outside air at 1000ppm.. i cal'd it at 400ppm outside then brought it in for some fun..

i tried dry ice first and it brought the room up nice.. then the burner.. which was nowhere close to a lb of dry ice sublimating under an hps light but it did work.. will be more specific when i get this meter actually calibrated with some real cal gas.