Product review (4 stars): Good little Unit
The Good:
This unit comes with a Z540-1 traceable Cal Cert that was done at 24.0C and 45.0%RH.
I compared it to another more expensive NIST Traceable unit in my lab and they agree almost perfectly. Instructions are easy enough but is not hard to figure out how to this unit without them. It comes with a tilt stand that is useable but it sets to a fairly low angle. This is a small unit but the display is very crisp and sharp and stays that way no matter what angle you view it from. It appears well built and solid.

The not as Good:
The included Cal Cert was already 6 months past issue. Be aware there is no decimal resolution on this unit, integers only for Temp and Humidity. This is likely OK for a lot of folks, but I want .1% resolution for my Calibration Reports. My one real complaint - to change the temperature readout from F to C you have to remove the tilt stand/battery compartment door to gain access to that switch. Very inconvenient. You could drill a small hole in the battery compartment door to get around this.

This unit is well built and is priced nicely for one that has NIST traceability. However it does have its limitations so I have ordered another (more expensive) unit with .1% resolution and a front panel F/C switch. I like this one enough to keep it as a spare