I've been considering having ph meters on my trucks for guys to instantly take a ph reading without having the delay of sending a sample to the lab. I have used the small probe kind that is common to the interior landscape industry and the label indicates it can be used in soils. Its accuracy has been fairly good, as we have sent the samples to the lab to compare readings and are usually right on or within a tenth. Do any of you use a particular ph meter? There are now so many marketed and durable designs that I would be more apt to get one that is heavy duty as the ones we have are fairly delicate. Thanks in advance.