- Non-contact Class II Laser with 1mW power output gives you precision for more accurate readings
- Distance to Spot Ratio is 12:1 provides more accurate readings at greater distances
- Includes backlit LCD screen, features auto off function and low battery indicator (Requires 2 AAA batteries, not included)
- Non-contact temperature gun thermometer is intended to provide accurate measurements for inanimate objects
- Measures in Fahrenheit or Celsius (Range: +26 to +716 F / -32 to +380 C) | Accuracy +/- 2 degrees
HDE Temperature Gun Infrared Thermometer w/ Laser Sight
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Take accurate temperature readings with this non-contact infrared gun-style thermometer. Easily switch between Celsius and Fahrenheit read out with the push of a button.
* Distance Spot Ratio: 12:1
* C/F Selection
* Response Time: 500ms
* Auto Power Shut-Off
* Automatic Data Hold
* Low Battery Indicator
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Digital Thermometer 8:1 distance:spot ratio for 380C decodes the model number.
I tracked a similar looking manual and nearly identical device to a Chinese factory, See comments.
The manual is nearly identical to the model I received. I can't disassemble the unit to check the PCB and makers mark since part of the unit is glued.
IR thermometers are calibrated against dark or black bodies, and perform worst with reflective surfaces like stainless steel, foil, or mirrors. For best results, point to dark to black surfaces.
I tested it as no worse than 10F off, at best 1F, when measuring dark to black bodies, respectively. Its rubber coating makes an easy grip. The trigger has a sharp click, its not soft and gummy. The LCD is easy to see, and the best angle for viewing its LCD is also the best angle for measuring, perpendicular to the measured surface. Beware that when the measured point is fairly close and localized, regional changes in irregular or curves surfaces can happen, like pottery, cups, and mugs.
Using a black mug and pot, I checked IR readings against 32F ice water and 212F boiling water. The temperature was compared against an Agilent thermocouple. The IR reading was 0.5-2F off from the immersed probe. IR reads of a hot Calrod heater was compared against a thermocouple to 900F+, and the IR thermometer read true, far above its rated temperature. It read body temperature 0-2F off compared to a standard oral thermometer!
At extremes changes of ambient temperature, the focusing lens need to acclimatize, the manual recommends 30 minutes. For example, if taken out to a hot summer day of 100F, from 70F air conditioning, the unit may read low. Likewise, from a warm car to the outdoors during winter. This low cost unit uses a Fresnel plastic lens which is prone to thermal deformation more than other lens materials. How much the error is depends on the extent of the difference between one ambient temp and another: if used too soon the IR light may not be optimally focused onto the IR detector.
I am impressed, so I bought another! I've been looking for a good deal on these for years, even Harbor Freight can't match it.
With 2 units now to compare I tested acclimatization, I took one unit to a 73F cold airconditioned room and left one out doors at 85F for 1 hour. Sure, enough, they were off ~3F when they were reading nearly identical earlier. After 1 hour with both units in the same room, they were off from 0-0.5F, awesome!
I've wanted one of these for years but didn't think I had a real use for one until now. The West side of my house gets warm in the afternoons, especially the dining room. I thought it was due to a 40-year-old single-pane drafty sliding door and had been looking at (expensive) options to replace it with a modern energy efficient model. I also thought the West-facing brick wall needed to be shaded by an expensive pergola or other high-maintenance plantings to help keep the West of the house cooler. I decided to get an inexpensive IR thermometer and more objectively measure where the heat is coming from.
After receiving the HDE temp gun I measured interior walls, floors, ceilings, blinds and framings to find where the hot spots are. To my surprise the walls and old non-sun-facing-windows-and-doors weren't appreciably warmer than the cool walls and floors. The ceiling, however, was consistently warmer and even hot near some corners. The roman blinds in the West-facing windows were 105 degrees!
Using the thermometer helped me decide to get outdoor shades for three sun-facing windows and start improving the attic insulation and/or ventilation. I discovered I had no soffit vents and am now installing some, and I am planning to install vent baffles and more insulation in the attic and perhaps some sealing foam where the hotter ceiling spots are.
I can't figure how much money I'm saving yet, but my spot-temperature-informed actions so far have two rooms feeling much more comfortable in the hot Texas summer afternoons. And I no longer want to spend $1k or $2k or more in modernizing my sliding doors and maybe a couple of windows because the old ones I have aren't significantly warming their surroundings.
On the fun side, of course the cat loves it and is teased while I am measuring ceilings and high walls. It uses a 9v battery instead of stacks of button batteries like my small cat laser pointer/toy. And, by the way, my cat's fur is 80 degrees Fahrenheit. I am looking forward to using my new toy while cooking. I am already measuring everything I pass and find it interesting how different plants are different temperatures.
I'm giving it 5 stars for value, utility and good instructions.
However I needed to wait for cold weather. The single digits finally arrived in last week.
I took it out of the packaging, put in a 9V battery. Closed the case. Pressed the gun. Nothing. Dead. Brand new battery. Dead.
I played around with the wires thinking maybe there is something loose internally, but no response.
Update: I did request a replacement and the replacement worked. So I updated from 1 star to 4 stars.
It does seem to give a fairly accurate temperature. It is also a good teaching tool for my 7 year old to show him the temp of the stove vs. bathtub vs. air coming out of the A/C. For $20 it seems like a good product to get an estimate of temperature.
Contacted HDE. It is out of warranty so I am out of luck.
I will be avoiding all HDE products in the future.
I occasionally use them on the grill to determine the temperature of the grate.