Product review (4 stars): Solid entry-level weather meter however a few drawbacks for serious enthusiasts
This is a solid little handheld weather meter with lots of functionality and use, however it is not without its shortcomings. Despite the price difference I will compare it with my Kestrel. Please note that the Kestrel meters are far more expensive so comparison it a bit unfair; that said, price should be a consideration.

Pros:
Easy set-up: It really couldn't be much easier, just turn it on and everything else is really intuitive. If you need any help the manuals are there but you really don't need them.

User-friendly display and functionality: I really like the imposed Beaufort scale at the top for wind readings, this is a nice touch. Lots of options to change readings for whatever range, averaging, or scale you want. Back light is great!

Accessories included: Includes battery, carrying case and lanyard

Inexpensive: self explanatory--for a fun weather instrument which is really portable it is a good buy

Cons:

Has a cheapness about it: almost too light in weight it appears fragile. All plastic parts, a bit rigid in appearance. Kestrel appears better made with plastic and rubber in the design.

Issues with changing thermal environments: When you move the WM-3 from a cold environment to a warm one (such as outdoors to indoors) RH readings spike as the meter warms. This is actually contrary to what is expected as when the environment warms without vapor pressure changes, the RH should decline. Eventually it equilibrates, but this is really an issue. Same thing when moving from warm to cold environments--RH declines quite a bit initially. Kestrel does not do this.

Lag in readings: If you want fast readings when changing environments, this meter falls short. Obviously there is a heat capacity to the plastic and it should take time to adjust for changing temperatures and humidity, however, in my opinion (and compared with the Kestrel) the time for the meter to accurately capture the new environments is too slow. You really need to waive it around to push air across the temp/humidity sensor.

Overall:
I give this product a 4/5 stars because it has some issues for serious enthusiasts and does come across as a bit cheaply made. Price is a huge benefit however, if you want a more solid weather meter you are going to have to pay for it. All in all, this is a fun device well worth considering!