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Red rugged infrared thermometer with pistol grip

Sentry

Sentry ST677 Infrared Thermometer -32~1650°C DS 50:1 electrician tool

SKU CH-PF7R-SYEJ1 MPN ST677

Measures surface temperature from -32 °C to 1,650 °C with a 50:1 distance-to-spot ratio and 0.1 °C resolution

  • Labor warranty1 Year
  • Color and finishRed
  • Number of items1 pack
  • Sold asBox
  • Parts warranty3 Years
  • Wide temperature range up to 1650 °C for extreme heat tasks
  • High 50:1 distance-to-spot ratio enables accurate readings from far away
  • Rugged ergonomic design withstands tough job-site conditions
  • 1 °C resolution provides fine detail on critical measurements
  • Three-year parts coverage backs long-term reliability

High-temperature infrared thermometer

The Sentry ST677 is a rugged infrared thermometer designed for electricians and technicians who need non-contact temperature readings up to 1,650 °C. It offers a 50:1 distance-to-spot ratio and a 0.1 °C resolution for precise measurements from a safe distance.

Target users and limitations

This tool suits professionals checking high-temperature equipment, electrical panels or industrial processes where contact probes are impractical. It is not for users who require contact measurement, data logging features or a lower temperature range for food safety or HVAC work.

Deciding specification

The maximum temperature range of -32 to 1,650 °C determines if this model covers your application. If your tasks stay below 760 °C or 1,300 °C, the ST670 or ST672/675 series provide the same rugged design at lower temperature limits.

How it compares

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

Price $259.99
Pricier than about 84% of the 5,006 comparable items (median $95.99).

Specifications

Product
Brand nameSENTRY
Model nameST677
Color and finishRed
In the box
Number of items1 pack

Questions about this item

What power source does the ST677 require to operate?

The ST677 runs on a standard 9 V battery, which must be installed before first use.

Can the ST677 measure temperatures below the -32 °C lower limit of my older ST670?

No. Both the ST677 and the ST670 share the same -32 °C minimum, so the ST677 does not extend the range further downward.

How do I verify the ST677 is reading correctly after installing the battery?

Aim at an object of known temperature; the display should show a value within ±0.1 °C of that reference.

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