Guess all the positive reviews never checked the pressure

So saw all the good reviews and figured this must be a good unit. Now I wonder if anybody that purchased this unit ever double-checked the pressure or if I just got a defective unit. None the less I cannot trust this after seeing the performance since I have a road trip in about a week. This unit was easy to understand and easy to set HOWEVER this unit is WAY off pressure. I have a few month old Tesla Model 3 and the TPMS indicated tires were low on pressure. All read about 37 PSI but when I hooked up this unit it read 30 PSI. I was a little skeptical but thought the TPMS sensors could be off. Aired up 2 tires to 42 PSI as indicated on the unit. I think turned on the car and one tire read 49 PSI and the other 46 PSI. I then pulled out the tire pressure gauge and sure enough 49 / 46 PSI when the unit read 42 PSI on both. I then tried another tire subtracting for the 5-7 PSI difference and found when I stopped the PSI on the gauge fluctuated about 2 PSI. This is just not acceptable. You reply on this unit to be correct and not to have to check pressure again. I encourage anybody that purchased this product to double check the pressures.

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