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Red thermal imager with rugged ergonomic body

Sentry

Sentry ST642 Thermal Imager DS 12:1 -32~535°C electrician tool

SKU CH-79XG-DJDX6 MPN ST642

Thermal imager with 12:1 distance-to-spot ratio measuring -32°C to 535°C and automatic emissivity detection

  • Labor warranty1 Year
  • Color and finishRed
  • Number of items1 pack
  • Sold asBox
  • Parts warranty3 Years
  • Measures from -32 °C to 535 °C for wide electrical diagnostics
  • 12:1 distance-to-spot ratio lets you scan safely from farther away
  • Automatic emissivity detection removes manual setup errors
  • 1 °C resolution reveals small temperature differences on components
  • Colour alerts flag readings that exceed your preset threshold

Thermal imager for electricians

The Sentry ST642 thermal imager is built for electricians and technicians who need fast, non-contact temperature checks on panels, motors and wiring. Its rugged, ergonomic housing withstands daily job-site use while the 12:1 distance-to-spot ratio lets users measure from a safe working distance.

Suited for preventive maintenance.

This tool suits professionals doing preventive maintenance, load-balance verification and fault-finding on standard electrical systems up to 535 °C. It is not intended for users who must measure temperatures above 535 °C or who require the extended 760 °C range found on other models.

12:1 distance-to-spot ratio

The 12:1 distance-to-spot ratio is the key specification that decides whether this imager fits the application. It defines how far the user can stand from a target while still capturing an accurate spot measurement, making it the primary figure to check against the required inspection distance.

How it compares

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

Price $151.99
Pricier than about 69% of the 5,006 comparable items (median $95.99).

Specifications

Product
Brand nameSENTRY
Model nameST642
Color and finishRed
In the box
Number of items1 pack

Questions about this item

Does the thermal imager require periodic recalibration of its 12:1 distance-to-spot ratio?

The 12:1 distance-to-spot ratio is a fixed optical specification; no recalibration is needed, though the lens should be kept clean for accurate readings.

What temperature ceiling stops continuous measurement on the ST642?

The upper limit is 535 °C; sustained readings above this point are outside the specified range.

How much heat does the unit generate during all-day scanning?

As a handheld infrared imager it produces negligible self-heating; the housing stays near ambient temperature during extended use.

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