measures co2 levels from 0-5000ppm 1000-1500ppm are ideal for plant growth the unit ... use in your indoor garden add a high-amperagerelay see below to control heating and ... has a 7° differential switch rated for 15amps dnc600 day/night cooling ... 4p operates on 120 volts ac with 15-amp switching capacity cyc604 cyclestat 4p ... 159.95 keep humidity under control the ... control devices with maximum draw of 15amps maintains best conditions for ... .95 protect your investment this high-amperagerelay transfers power to large fans ... systems that require high voltage or amperage service and prevents premature failure ... insufficient power supply provides 30-amp switching capacity with 120v trigger ... installed by an electrician har600 high-amperagerelay 209.95 thermostat humidistat an ...