Review on Proster Autoranging Multimeter: A Comprehensive AC/DC Current Voltage Tester with 6000 Count Digital Multitester for Amp, Ohm, Volt Meter Capacitance, Temperature Measurement, and Continuity Testing by Johnny Murphy

Didn't use enough features to evaluate anything other than temperature: A number of complaints that the device only displays temperatures in C (or some say only in F) This is incorrect. I set it to Celsius by default, but like the other features, this is changed by simply pressing the blue DC/AC button. I'd rather run it on F than C, but that doesn't matter. (and maybe a way to change the default?) BUT: My proster is consistently high at 6 degrees Fahrenheit. I tested it with 4 other temperature sensors against an extremely accurate PID RTD and a Honeywell thermometer. It reads high on ALL sensors and also in ambient temp mode "no sensor". And I put the supplied sensor on the ExTech unit which reads 4 degrees below zero all the time and the Proster sensor also reads 4 degrees below the ExTech level. So my Proster seems to have been miscalibrated from the factory. And since the temperature measurement was the main reason for buying this device, this is a serious problem. Of course I can mentally compensate for that as it seems to be consistent across my range of use (10-200 F), but definitely not what I was expecting. I will try to find calibration information for this device or return it. Update 2: Proster customer service sent me a replacement unit and the temperature function works on it. Very good customer service.