I got tired of "arguing" with my mentor at the local OWS spot and got this https://www.amazon.com/gp/product/B075X1MPRW/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 Company makes temp probes for the regulated food industry. P.S. works very well. I have probe attached to my safety buoy. 1 minute sampling rate.