For anyone looking for a co2 meter I found some for 130.00 at co2 meter .com Ive had one for about 6 months and it is a nice one it has co2 level temp and rh.
The meter thealien1111 got has CO2, temp and %RH. The one on sale now is CO2 only - that is why it is cheaper.
Because this was not clear, if you buy a TIM8 CO2/temp/%RH meter like aliens and put in the code ROLLITUP on checkout your final price will be $179.95 less 20% is $144 - still a great price. If you want CO2 only, the $129.95 CAM meters are still on sale till we run out.
I'm only doing this for the first five of you who read this, so don't tell anyone else.