The unit is well built, solid. It has every thing you need to work around your house and more. Compared with other testers and this one was the one I trusted most. It takes a brief familiarization to get used to all the functions, but after that, it works exactly how you want it to work. The modes and brightness levels are customizable, so even the craziest among us should find something that works for them. The results are quick and normally consistent. Great item great price for spot checking pH.