Will this give accurate readings of ambient air temperature?

Yes, but you would have to have the tip off of a table or whatever that might be a different temperature and hold it in your hand by the dial. All of these are able to be calibrated. Put in a cup of ice and set the dial to 33°.

What country is this made in?

The company Supco is located in Bronx, NY at Supco.com, had it awhile, still works well if that helps.

can this be calibrated by nut on back for rotating dial?

I believe so. There is a nut on the back, but I haven't had to recalibrate mine yet.

What is the diameter of the stem? I've got a 3/16" hole that I'd like it to fit into

The one I have measures .150", so it should easily fit into a 3/16" hole which is .1875".

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Supco ST02 Stainless Steel HVAC/R Pocket Dial Thermometer, 0 to 220F | HVAC, Air Conditioner, Refrigerator, and Freezer Temperature Gauge Probe or AC Vent Tester, 5 in Stem, Analog 1 in Dial

Product ID: 6669158

Details

Age Range (Description)
Adult
Brand
Supco
Color
Silver
Display Type
Analog
Included Components
Storage Case
Outer Material
Stainless

💧Waterproof durability

🔧5-inch stainless steel stem

🌡️0-220°F range

$19.30

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Description

🌟 Stay cool, stay precise — the pro’s pocket powerhouse!

ALWAYS ON HAND - Compact pocket clip and protective sheath keep your essential tool ready for action
REACH THE HARD TO GET - 5-inch probe stem accesses tight vents and appliance interiors with ease
PRECISION IN EVERY DEGREE - Accurate 0-220°F analog dial for quick HVAC/R temperature checks
VERSATILE HVAC R ESSENTIAL - Perfect for air conditioners, refrigerators, freezers, and more—your all-in-one cooling verifier
BUILT TO BRAVE THE ELEMENTS - Waterproof stainless steel design withstands tough job site conditions

The Supco ST02 is a rugged, waterproof stainless steel pocket dial thermometer designed for HVAC/R professionals. Featuring a 0-220°F range on a clear 1-inch analog dial and a 5-inch probe, it delivers fast, reliable temperature readings in hard-to-reach spots. Compact and portable with a protective sheath and pocket clip, it’s the trusted tool for air conditioning, refrigeration, and freezer temperature monitoring.

Specifications

ASIN	B003CL9LMC
Additional Features	Waterproof
Age Range (Description)	Adult
Age Range Description	Adult
Best Sellers Rank	#3,542 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Dial Thermometers
Brand	Supco
Brand Name	Supco
Color	Silver
Customer Reviews	4.6 out of 5 stars 2,305 Reviews
Display Type	Analog
Global Trade Identification Number	00687152032525
Immersion Depth	5 inches
Included Components	Storage Case
Indoor Outdoor Usage	Indoor
Item Length	5 inches
Item Weight	13.61 g
Manufacturer	Supco
Model	ST02
Model Name	ST02
Outer Material	Stainless Steel
Part Number	ST02
Power Source	Battery Powered
Product Care Instructions	Do Not Soak, Wipe Clean
Response Time	500 milliseconds
Reusability	Reusable
Special Feature	Waterproof
Specification Met	RoHS
Style Name	Classic
UPC	687152032525
Unit Count	1 Count
Upper Temperature Range	220 °F

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TrustScore 4.5 | 7,300+ reviews

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$19.30

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Smooth transaction and product arrived in perfect condition.

3 weeks ago

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