Digi-Stem® DST500 Series RTD Thermometer

Digi-Stem Meters & Probes are sold separately and paired together to create a complete custom system. This listing is for the meter only.

Please review our Order Guide and choose the meter power source, mounting, and other specifications needed to build a meter.


Digi-Stem® meters and probes are sold separately for a completely customizable system. Our popular Wahl Digi-Stem® Digital Thermometers available with RTD sensor probes.  Our RTD models have a wide temperature range and high accuracy design for applications that require accurate and reliable temperature monitoring.

Our Digi-Stems® are known for their reliability and rugged cases.  The housing is stainless steel with a NEMA-4X rating.  Dimensions are 5.3 inches wide x 4.3 inches high x 2.7 inches deep (13.5cm wide x 10.9 high x 6.9 cm deep).  The large 1 inch high LCD display is readable from 30 feet away.

Choose from rigid, remote, or adjustable angle RTD probes built to order to customer specification and sold separately.  The DST500 Series features programmable “R0” for “matching” the sensor to meter.

Polycarbonate H frame is standard; choose optional stainless steel for additional protection against RF interference and moisture intrusion.

Standard models are powered by and shipped with one C size, Lithium Thionyl Chloride, 3.6V battery.  Due to shipping restrictions, meters with this battery must be shipped by ground transport.  For international or air shipping, choose the "I" option, configured for and powered by one AA size, Lithium Thionyl Chloride, 3.6V battery, or the "NB" option for the meter only with no battery included:  purchase the required battery from a supplier near your location.

The DST500 is USDA accepted equipment; meets current USDA 9CFR318.305 for canned meat and 9CFR381.305 for canned poultry products.

An FM approved model of this item is also available.

DST500 Series Lithium Metal Battery Installation and Return Shipment Instructions


H Frame Material

DST500: Polycarbonate
DST540: Stainless Steel

Temperature Range

-328° to 1472°F (-200° to 800°C)


°F and °C, switchable

Meter Accuracy

± 0.1°F/C, over 1-year period (@ Tamb = 23°C ± 5°C)

Meter & Probe Accuracy

Greater of ± 0.4°F / 0.22°C or ± 0.5% of reading, over 1 year period (@ Tamb = 23°C)


1.0 inch 4-digit LCD display with icons for °F, °C, and low battery.

Display Resolution

< 1000 = 0.1°; > 1000 = 1°

Sample/Display Rate

2 Seconds, adjustable in 0.25 Second intervals to between 0.25 and 10 seconds with software


10 to 100% RH, non-condensing

Ambient Operating Temperature

-40° to 158°F (-40° to 70°C)

Ambient Temperature Coefficient (From 23°C ± 5°C)

Maximum of 0.003°/°C over Ambient Operating Temperature Range from 23°C ± 5°C



Battery Power

Standard Model: 1 - C size, Lithium Thionyl Chloride, 3.6V
International model: 1 - AA size, Lithium Thionyl Chloride, 3.6V

Battery Life

C Size Battery: >1 year nominal at 2 second update interval


Stainless Steel, NEMA 4X rated


5.3 inches W x 4.3 inches H x 2.7 inches D (13.5 cm W x 10.9 H x 6.9 cm D)


2 lbs (1 kg)

CE Approval

DST500 models only

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