I have my heat pad hooked up to a Hydrofarm. I had it set to 89 and had it running for 2 weeks before eggs were layed. I noticed it would drop to 85 so i set it to 91 and it stays between 89 and 91 never any hotter. Right now the hydrofarm says 89 and the $6.00 thermometer i bought on amazon says 86... the hydrofarm's probe is probably more reliable right? Either way I'm purchasing a helix in 2 days from a local guy who is selling off his collection. Should I be okay for 2 days?