- Probe is sealed in glycol solution
- Min/max memory
- High and low settable alarms
- Patented unit fulfils all CDC thermometer and vaccine thermometer requirements
- Measures 2.75" width by 4.25" height by 0.75" thick
Thomas Traceable Refrigerator/Freezer Plus Thermometer, with 5mL Vaccine Bottle Probe, -58 to 158 degree F
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Specifications for this item
|Number of Items||1|
|Lower Temperature Rating||-58|
|Size||-58 to 158 degree F,|
|Temperature Accuracy||+/- 1|
|Upper Temperature Rating||158|
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Accurately monitor temperatures in freezers, water baths, heating blocks, incubators, and refrigerators with this enclosed temperature-buffered sensor. Bottle insulates sensor from rapid temperature changes when refrigerator door is opened. Patented unit fulfils all CDC thermometer and vaccine thermometer requirements. Triple display simultaneously shows high, low, and current temperatures. min/max monitors high/low readings overnight, on weekends, or for any time period-a significant advantage over current reading-only glass thermometers. Range is -58 to 158 degree F with a resolution of 1 degree and accuracy of +/-1 degree C. Alarm feature provides alert when temperature rises above or falls below a set point. Alarm is programmable in 1 degree increments. Visual and audible signals continue even if temperature returns to non-alarm range. Ten-foot micro-cable permits refrigerator doors to close on it. Solid-state probe eliminates mercury contamination in refrigerators. Probe is sealed in a miniature bottle (1 x 2.5") filled with nontoxic glycol. Solution is GRAS (generally recognized as safe) by the FDA (Food and Drug Administration). Eliminates concerns about incidental contact with food or drinking water. To assure accuracy an individually serial-numbered Traceable certificate is provided from our ISO 17025 calibration laboratory accredited by A2LA. It indicates traceability to standards provided by NIST (National Institute of Standards and Technology). High-impact, chemical-resistant ABS plastic case. Measures 2.75" width by 4.25" height by 0.75" thick. Weight is 4 ounces. Supplied with Traceable Certificate, flip-open stand for lab bench, slot for wall mounting, and Velcro and magnetic strips to attach bottle unit to any surface.
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I'm reviewing this as an option for a home refrigerator alarm, not a vaccine refrigerator alarm.
- Alarm can't be hushed, though it can be turned off and back on with
with a switch on the front. Of course you'll have to remember to turn
it back on without a hush button.
- Offers the pros and cons of a wet temperature probe (see below).
- Wire is 1.1 mm skinny (app. 3/64") which won't cause much of a
problem with most fridge door gaskets.
- The unit you receive is certified to be +/-2F.
- The bottle isn't wide enough to stand on a shelf alone as it is
mimicking a vaccine bottle, nor is there a mount for it for use
inside the refrigerator. I wrap the cord once around a shelf
bracket, you might find a more elegant solution.
- It does look a little industrial/commercial like its intended use
which is fine for me but that is something some folks might
take into consideration.
- The manufacturer is Control Company.
I tested the alarm to be 66 dBA (decibels) which makes it loud enough to hear in a room next to a kitchen unless things are quite noisy. This is, however, much quieter than some other refrigerator alarms. The house needs to be quiet to hear from floor to floor and it is unlikely to wake anyone up. A loud television, loud fan, or light headphones is enough to drown it out.
The alarm goes off for the first minute after a min/max temperature threshold you set is passed. Afterwards it mostly goes off once per minute for around 3 seconds of quick beeping. Occasionally it goes off for an entire minute, but it is mostly once per minute for 3 seconds or so each time. This makes the alarm more difficult to notice, as well.
You can't temporarily hush the alarm, though you can shut it off and back on with a switch on the front. Otherwise it won't stop until the temperature falls back within your set temperature range. A hush capability would be a nice feature. For those that were wondering why the alarm wasn't more annoying, this is probably it.
WET vs. DRY PROBE (this is a wet one):
To demonstrate the difference between a dry probe and a wet probe (like this one) measuring the temperature of a liquid, let's do a test.
Let's open the fridge door completely for 15 seconds and then close it leaving a 1/2" gap for 30 minutes and measure the effects on temperature. One measurement is done with this device using its dry probe to measure air temperature, the other is with another test device that uses a wet temperature probe, which means the probe is inside a bottle filled with a liquid. This latter probe better approximates the temperature of the food and liquids in the fridge, not the air directly, and so is not as immediately susceptible to swings in air temperature.
Min Wet Dry
00 37F 37F
01 37F 37F
02 37F 39F
03 37F 39F
04 37F 40F
05 37F 40F
06 37F 40F
07 38F 40F
08 38F 41F
09 38F 41F
10 39F 41F
11 39F 41F
12 39F 42F
13 39F 42F
14 39F 42F
15 39F 42F
16 39F 42F
17 39F 42F
18 39F 42F
19 39F 42F
20 39F 42F
21 39F 42F
22 39F 42F
23 39F 42F
24 39F 42F
25 39F 42F
26 39F 42F
27 39F 42F
28 39F 42F
29 39F 42F
30 39F 43F
As expected dry temperature probes will give you earlier warning, which may be preferable to you, though for some purposes you may prefer to use a unit that uses a wet probe. With most common inexpensive mini-fridges, for example, due to the often great swings in air temperature, the use of a wet bulb probe in a refrigerator alarm might be highly suggested.
Note that when I make the open door gap quite tiny (much smaller than the above test) it didn't actually increase the temperature of the inside air beyond the initial 2-5 degree drop. After that it just made the fridge work harder for longer. While this, of course, both increases electricity costs and likely reduces the lifetime of the refrigerator, it should make folks a little less nervous about very small accidental door gaps for short periods. I found this result during testing, your results may vary. The fridge tested isn't particularly powerful.
It is notable that it took only 10 minutes for the estimated temperature of the contents to rise 2F even with such a small door gap. It only took 12 minutes for the air temperature to rise 5F.
So dry probes will often give you quicker notification that the fridge door was left open, while wet probes will give you a better idea how the contents themselves are doing.
Scenario #1: You go out for a long time and come back to the house to find the alarm going off. The wet probe will give you a better idea if the contents have gone bad.
Scenario #2: You are going to bed and leave the fridge door open. If it was a dry thermometer there is a better chance the alarm will go off before you get out of the range of the alarm.
So there you go, some things to think about when considering wet vs. dry temperature probes.
Hope this helps someone :)