Programmable Digital AC Single Phase Power Watt Meter (Blue LED w/ Control & 20mA)

I purchased an HB404 AC Wattmeter, specifically the 404PWA, earlier this year and discovered a great number of errors on the datasheet (corrections will be published in the product forum at lightobject.info). 

Nonetheless, once you figure them out and get it properly connected and programmed, it works fine.  The 20ma output seems accurate as well. The relay outputs are confusing to set, but then work fine too.  If only the AC version also included the ability to display voltage and current as well, like the DC models do!