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Red handheld thermal imager with digital display and laser sighting

Sentry

Sentry ST633 Thermal Imager -35~630°C 12:1 DS ratio

SKU CH-WCAG-SHY5R

Compact thermal imager measures -35 to 630 °C with 12:1 spot ratio and selectable emissivity

  • Labor warranty1 Year
  • Color and finishRed
  • Number of items1 pack
  • Sold asBox
  • Parts warranty3 Years
  • Wide range -35 to 630 °C for diverse tasks
  • 12:1 distance-to-spot ratio measures small targets far away
  • Selectable emissivity 0.95 0.70 0.30 suits different surfaces
  • Fast 500 ms response gives quick readings
  • Compact 156×100×32 mm and 136 g fits in a pocket

Compact thermal imager for electrical diagnostics

The Sentry ST633 is a pocket-sized thermal imager built for electricians and maintenance technicians who need fast, non-contact temperature checks on panels, motors and HVAC equipment. It measures from -35 to 630 °C with a 12:1 distance-to-spot ratio and a 500 ms response time. A selectable emissivity of 0.95, 0.70 or 0.30 lets you adapt to different surface materials.

Suits spot checks on live circuits.

This tool fits technicians who carry out periodic inspections and want a lightweight device that fits in a tool bag. The auto power-off after roughly six seconds saves battery life during intermittent use. It is not intended for users who need data logging, image capture or a wider temperature span beyond 630 °C.

12:1 distance-to-spot ratio sets the measurement

At the 12:1 ratio the measurement spot grows one unit wide for every twelve units of distance, so accurate readings on small components require working relatively close. The fixed emissivity choices of 0.95, 0.70 and 0.30 cover common electrical surfaces but cannot be tuned for unusual coatings.

How it compares

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

Price $104.99
Typical for this category: the median of 5,006 items is $95.99.

Specifications

Product
Brand nameSENTRY
Model nameST633
Color and finishRed
In the box
Number of items1 pack

Questions about this item

How much heat does the ST633 generate when I leave it running all day?

The imager itself produces no measurable heat; it draws power only from its own batteries and has an auto power-off after approximately 6 seconds of inactivity.

What must I supply before the ST633 will operate?

Batteries are not included, so you need to provide your own power cells before first use.

Can I keep using my older ST630 or ST632 accessories with the ST633?

The ST633 is a standalone unit with its own 12:1 distance-to-spot ratio and selectable emissivity settings of 0.95, 0.70 and 0.30; no accessories from earlier models are required or referenced.

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