With my new single vessel setup I find it awkward to get a mash pH reading. I have a 20g kettle with a solid side mesh basket for the grains and a recirculation arm for the wort. The arm is under the mash bed and secured with tri clamps so I can't steal a sample with it. The drain is being used by the pump. I'm left with just skimming a sample from the top. Is that good enough? Even though I'm recirculating I assume there is a big difference between the top and bottom of the kettle. But I can't think of another way to get a sample.