MarcXLanswered grow question 5 years ago I don´t think it is worth buying. Can´t imagine that this device can precisely measure the EC. Good EC-Meters have to be calibrated and cost about 60$, and theese can also measure the temperature.
The Lux-meter is unnecessary when growing in a tent, also the Lux cant tell you anything about the light quality as it´s made to measure sunlight.
So what remains is the soil humidity sensor. I don´t know if that thing is accurate enough, I would rather use old school methods like lifting the pot and feel the weight and looking on the plants to see when water is needed.
Therefore I would rather buy some good PH and EC-Meter.