Digi-Stem® DST550 Series Min-Max Recording 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.


The Wahl Digi-Stem® DST550 Digital Thermometer are designed for use wherever the recording of Minimum and Maximum temperature is required.  Min-Max data is recalled by depressing an operator  interface switch.

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 DST550 Series features programmable “RØ” for “matching” the sensor to meter.

The DST550 is 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 "NB" option for the meter only with no battery included:  purchase the required battery from a supplier near your location.


Probe Type / Sensor

Pt100, Class A 4-wire platinum RTD sensors in MgO packed MI cable.
RØ = 100Ω, Alpha = .00385 Ω/Ω/°C

H Frame Material


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 high 4-digit LCD display with icons for MIN, MAX, °F, °C, and low battery.

Display Resolution

< 1000 = 0.1°; > 1000 = 1°

Sample Rate

User Selectable; 6 seconds or 60 seconds

Ambient Operating Temperature

-40° to 158°F (-40° to 70°C)


10% to 100% RH non-condensing

Low Temperature Survivability

-70°F (-56.7°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

1 - C size, Lithium Thionyl Chloride, 3.6V

Battery Life

2 year minimum


Stainless Steel Enclosure with Polycarbonate H Frame and Window, 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)

Shipping Restrictions

Yes; for models that include C size, Lithium Thionyl Chloride Battery, 3.6V