Product review (5 stars): Accu-Rite 00609SBDIA2, and use mine to monitor crawl space humidity
This isn't the exact same mode, but it looks identical (mine cost $16.99 from a big box store).  Have had for 3 weeks and so far, it's very accurate and easy to use.  I placed my "outdoor" unit into my 4 ft tall crawl space, to track humidity and ensure the dehumidifier is working properly (instead of crawling down and checking it out), with the main unit in my master bedroom.  While I typically don't have humidity issues, I recently installed a dehumidifier to ensure that the space stays drier during the rainy seasons (Louisville, Kentucky area, where it's typically wet in the Spring/Fall) (am highly allergic to mold, so this is to somewhat control the amount of mold which is typical in a home).

Regarding temperature and humidity, both have been very accurate so far as compared to the temp/humidity per my dehumidifier, as well as individual humidity / temperature gauges installed in the crawl space several years ago.

Regarding the "outdoor" unit, I have it hanging about a foot below a support beam (used a nail and picture hanging wire), away from the dehumidifier.

If things change after having used this for a while, I'll update.