I just ordered this one off amazon about 3 weeks ago been using it to test my flower room before plants go in there, seems to work good, nice features being able to mount the "remote" inside your area and then put the display where ever you would like, also records the max and minimum but you have to manually reset it every day, easy enough,
La Crosse Technology WS-9160U-IT Digital Thermometer with Indoor/Outdoor Temperature
https://www.amazon.com/dp/B001DNIIOS/ref=cm_sw_r_sms_awd_hP5jxbRAH0BHE
I also have been using one of these just draped over my exhuast for my lights so the sensor is hanging at canopy level, between the two they are almost always reading the same as one another so again, very accurate also the aquarium ones take it to the tenths place which is nice seeing as I also use those in all 3 of my Rezs,
AODE® (2-Pack, Black & Yellow) Digital Fish Tank Aquarium Thermometers 600012
https://www.amazon.com/dp/B0177WLAL6/ref=cm_sw_r_sms_awd_WR5jxb8D4AD8F
with that being said I also have a handful of the acurite ones from Amazon and those ALWAYS read high, sometimes 5-8 degrees higher then the others.
(Especially do not put those acurite ones in direct light) trust me, I thought I couldn't get my room under 93 degrees then put one out of the direct light and it was like 72, also the infrared ones like the aquarium thermometers are nice because they seem to not be effected by the radiant heat from the lights, reads accurately hanging at canopy level, I also keep a good ol analog thermometer hanging on one of my studs as well. Probably the most accurate out of all of them.