Works really great.

Was looking for a digital Thermometer for when I soon evacuate & recharge my vehicles A/C. Wanted a Probe model to insert into diffuser. This should do well. Tested against two other Thermometers with less than 1°F diff. ( see pix). So, the probe is sensitive enough where Temp. changes very quickly,( with 1/10 of a deg), however, it took a few min. for the final actual temp. to display. Another reviewer stated an " old school" trick is to remove the F/ C jumper then place bk at a 90° angle to one pin so as not to loose the jumper. Don't do that, as it won't fit, because hole there, not Lg enough. USB pwr supply just fine as vehicle has that. No batteries to ever worry about. Unit powers On/Off with USB connector.

Tach is in the right range for most uses.

This is the second unit I purchased. The first one has been working for 2 years, 24/7 without fail. I'm very confident this one will perform just the same. Accurate and very reliable unit.

Bro this thing is stimulating as funky beats in house music. Bro the colors on the display really pop, mixed with the live activity on screen makes this little pop and stand out. This gets my nerd on dog. Like I have only been able to find flat analog stricly numerical displays with maybe one color and only the numbers change but not this little guy. This guy has the gauge, the bar graph that changes in correlation with the numbers and little thermostate image thats programmed into the display and not just a sticker. Bro Im straight up in love with this thing I even went and bought another one for double the stimulation thats right baby one for the car and one for my room so I can stare at it and appreciate its beauty. Who ever designed this thing deserves a crisp high five dude .I Just wish it was a little thinner but honestly It still looks great like a little bulk gives it that retro look which also gets my nerd on.