I have several meters,one a expensive Fluke and one a freeby Harbor Freight.
When I got my new camper with LED light,I checked the power draw with both meters.
I then checked the draw of the TV with DVD player,
the heater,the waterpump and the Fantastic fan.Iused both meters to see if there was any difference and and they were both very accurate.
I did find at higher amps,over 4,that the leads on the cheapo meter would not give good readings,but when I switch leads with the Fluke,the readings were good.
Anyone with 12v shoud have a good Vom and know how to use it
OLD 2006 F150 4wd 7200gvw,Lt275-65-18,Scan Guage,Garmin,flowmaster,load levelers,Firestone work rites Bronco 800
NEW 2015 F250 Scab 4wd 10000 gvw, 6.2 Scan guage,Garmin,work rites,3200 lb load,1800lb Palomino Backpack SS1200