Instruction/Operational Manual

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Manufacturer of Temperature and Pressure Instruments and Controls Since 1882

905 Waverly Avenue, Holtsville, NY, 11742


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Weiss Instruments is the leader in Solar Powered technology* as we now offer seven different versions of our Digital thermometers. Available in lowlight version 56SD, (15 Lux) 25SD,72SD, (30 Lux) and Series 20SD (75 Lux). These "self powered" thermometers operate without any batteries and offer an attractive and modern update to existing refrigeration equipment. Each thermometer has adjustable calibration, a ten second update time and wide ambient temperature specifications for both indoor and outdoor installations.


*Patent No. 5,196,781



NSF Model Cat. No. Case Range1 Sensor Length2
SD 20SD-BS Back Flange 40/0/160°F 05ft
SD 20SD-HL Hanging 40/0/160°F 05ft
SD 20SD-FS Front Flange 40/0/160°F 05ft
SD 25SD-160 Horiz. Wall Mount3 40/0/160°F 05ft
SD 56SD-160 Front Flange 40/0/160°F 05ft
SD 72SD-F-160 Front Flange 40/0/160°F 05ft
SD 72SD-U-160 U-Clamp 40/0/160°F 05ft

Economy Battery Type Panel Meter


1. Equivalent °C available, consult Factory.

2. Longer line lengths available. 3. Offered in black or white case.

LC58 Panel Mount with clips 40/0/230°F 04ft

© 2018 Weiss Instruments LLC, 905 Waverly Avenue, Holtsville, NY 11742 • 631.207.1200

Original Equipment


Food Service

Air Conditioning

and Refrigeration


Plumbing, Cooling

and Heating