Hanna pH 4.01 Calibration Solution, 20 ml, case of 25 water-pumps-&-irrigation-supplies this thermostat controls power to

this thermostat controls power to the fans with separate settings for lights on and lights off temperatures

Maximize your lighting setup without adding more lamps or additional heat sources

Also contains non-plant food ingredients: humic acids derived from leonardite and peat

It also allows for automatic operation to start or close when faucet is turned on or off

Hanna pH 4.01 Calibration Solution, 20 ml, case of 25 water-pumps-&-irrigation-supplies this thermostat controls power toHanna's Buffer solutions are made from established formulas and are standardized with a pH meter that is calibrated to NBS NIST primary standard buffer solutions. The 20 ml sachets are ideal for infrequent calibrations while for heavy duty applications, you can choose from the popular 230 ml, 1 liter, or 1 gallon containers. Now the pH 4 buffers carry lot #, expiry date as well as pH C chart on every bottle. HI 7004L C and HI 8004L C are also supplied