Temperature not accurate
921969
Voltage appears accurate but temperature reads 6 degrees high when compared to several other thermometers.
2168706
I bought this because the oven in my new house takes much longer to cook things than listed in the recipe.  The temperature is measuring about 30-40 degrees less than the oven is set for.  It is difficult for me to believe that this is the case.  If my oven temp were this much off, food would never cook.  I'm going to purchase another brand to recheck the oven temp.  If the really low temps are consistent, I will come and modify this review.
2728319
I got this to monitor the temperature of my fermentation vessel using a Raspberry Pi 2.

It worked well for the first batch of beer; the temperature was +/- 2 degrees.

However, every time I've tried to use it since then, it has been wildly inaccurate. It fluctuates between 10-20 degrees higher than the actual temperature.

I've verified the temperature using a standard analog thermometer, as well as a digital thermostat (Johnson Controls Digital Thermostat Control Unit - A419ABG-3C), and this device always reads 10-20 degrees higher.
1481094
It seems like the temperature is always 2 degrees higher than what it it actually is.  I have an A/C in the room where this is and it indicates an indoor temperature 2 degrees lower.
2067084
I don't know if it's inaccurate or just really sensitive. I had the unit and the cable sitting in the same spot and it was reading a 5 degree difference. Then while it was snowing I put the cable part outside and kept the unit inside, and it said outside was warmer than inside (my inner gut thermometer told me that was incorrect). Although a possibility was the sun was hitting the metal probe and maybe making it warmer? I don't know. Overall it's alright. I wouldn't buy it again, but it seems to fluctuate in tune with the weather so it gives me a ballpark temp to work with.
4034300
I've only had mine for 6 weeks and it is no longer precise in the temperature readings - they are constantly off by several degrees. And it is now outside of the window for returns by Amazon so I have a dud it seems :(
3898848
Product does not give an accurate reading. It registered 195 degrees plus in multiple spots on a chicken. I was surprised to see that I over cooked it, and I grill a lot! But another thermometer in which I trust registered 140. I cut it open and sure enough it was not done. The product is defective.
4453369
Temperature gauge is off by 6-8 degrees. It looks good, but the disparity with other thermometers and weather-on-line reports is disappointing.
2604515
I would not recommend this product. If I still had the box, I would return it. In warmer weather it was always showing 10 degrees above the real temperature - we thought it was because the sun shone on our porch so strongly that it caused it to misread. However, today it is 30 degrees outside and cloudy and the thermostat shows 43 degrees.
281203
The temperature was off way out of the advertised accuracy,sometimes being 7 degrees off. It does not include any way to calibrate the device. The humidity sensor worked well though. The plastic casing of the device feels okay, but it's nothing to write home about.
3819234
The inside temperature is not correctly calibrated for me. I mailed La Crosse support, and they were unhelpful. I should have returned it when I could.
303034
This product works great to maintain temperature on my Weber kettle and my UDS but the temperature is not accurate. Mine is anywhere between 25-50 degrees colder in the smoker than it says on the Guru. I have a thermostat that is accurate so I can maintain the proper temperature, but it would be much better if the temperature the Guru read was accurate.  Overall a good product, but could be better. For the price it works well.
4409537
Not accurate. Humidity off by 13% compered to calibrated humidity sensor. Temp off by 4 degrees. Not returnable
3828204
Does not track the outtside temp and pressure like it should.
4587851
Brought this thermometer to the vet clinic to compare reading with a traditional renal thermometer.
Temperature taken with this thermometer is NOT ACCURATE
3325695
Never accurate; I bought two and they never show the same temperature or humidity. The temperatures are off by 20-25 degrees and the humidity by about 10%.
1004238
I bought this about a month ago.  It was accurate at first.  Then yesterday, when I cleaned the tank, I moved the probe.  I didn't drop it, or yank on the cord, just gently moved it.  When I put it back the temperature read ~4 degrees below the true temperature.  I've turned it on and off and replaced the battery, but it's still inaccurate.  Not good.