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Red handheld infrared thermometer with pistol grip and digital display

Sentry

Sentry ST658 Non-Contact Infrared Thermometer Electrician Tool

SKU CH-9V8N-KDHM4 MPN ST658

Measures surface temperature from -50 to 316°C with a 12:1 distance-to-spot ratio and 0.1° resolution

  • Labor warranty1 Year
  • Color and finishRed
  • Number of items1 pack
  • Sold asBox
  • Parts warranty3 Years
  • Measures surface temperature without contact for safety
  • 12:1 distance-to-spot ratio targets small areas accurately
  • Reads from -50 °C to 316 °C for versatile use
  • 1 °C resolution detects fine temperature changes
  • Rugged compact design suits low-temperature applications

Non-contact infrared thermometer

The Sentry ST658 measures surface temperature without contact, covering a range of -50 to 316 Celsius or -58 to 600 Fahrenheit. It uses a 12:1 distance-to-spot ratio and provides a resolution of 0.1 degree. The tool is built for low-temperature tasks such as HVAC audits, food checks or science work.

Suited for quick surface checks

Electricians, HVAC technicians and hobbyists who need fast, non-contact readings on cool or moderately hot surfaces will find it useful. It is not for buyers who need probe contact, data logging, higher temperature limits or certified calibration for critical processes.

12:1 distance-to-spot ratio

This ratio decides the measurement area relative to distance; at 12 cm away the spot is roughly 1 cm wide. If the target is smaller or farther than the ratio allows, the reading will average surrounding surface temperatures and lose accuracy.

How it compares

Measured against everything we stock in Electrical Trade Tools & Kits, at today’s prices. Recalculated every night.

Price $173.99
Pricier than about 73% of the 5,006 comparable items (median $95.99).

Specifications

Product
Brand nameSENTRY
Model nameST658
Color and finishRed
In the box
Number of items1 pack

Questions about this item

Should I choose the ST656 or the ST658 model?

Both the ST656 and ST658 share the same 12:1 distance-to-spot ratio, a temperature range of -50 to 316°C, and 0.1° resolution, so either model suits low-temperature tasks.

What does the -50 to 316°C range mean for everyday HVAC or food checks?

The range covers frozen storage at -50°C up to hot surfaces at 316°C, letting you scan duct temperatures, refrigeration lines, and cooked food surfaces without contact.

How does the 12:1 distance-to-spot ratio affect where I can measure?

At a 12 cm distance the thermometer reads a 1 cm spot, so you can stand back from hot vents or moving machinery while still targeting a small area.

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