The Extech 475040-SD and 475044-SD are handheld digital force gauges with integrated SD memory card datalogging. Both models share an identical user interface, sensing-head architecture, and feature set; they differ only in measurement range and resolution. The 475040-SD covers 3 to 5000 g (also expressed as 0.10 to 176.40 oz or 0.03 to 49.03 N), while the 475044-SD covers 0.02 to 20.00 kg (0.07 to 44.10 lb or 0.3 to 196.12 N). Each unit uses a load-cell transducer with a universal threaded sensing head that accepts the five mechanical adaptors supplied in the box.

Digital force gauges of this class are used wherever a quantified pull or push force value is required: spring testing, closure-force and actuation-force verification on consumer products, peel and tensile checks on packaging and labels, component insertion and extraction studies, and small-mechanism characterization on production benches. The instrument automatically distinguishes tension from compression — tension readings display as positive values and compression readings display as negative values — so a single gauge handles both directions without reconfiguration. The reversible display means the gauge reads correctly whether held in hand or mounted inverted on a test stand.

ValueTronics has supported the test-and-measurement community since 1992 and stocks both 475040-SD and 475044-SD variants alongside the broader Extech catalog. Every unit dispatched from our 20,000-square-foot secure facility at 1675 Cambridge Drive in Elgin, Illinois passes through hands-on inspection and functional verification by our technical staff before it ships. That on-site testing infrastructure is the reason engineers, quality managers, and procurement teams across North America rely on ValueTronics rather than pass-through brokers that never see the equipment they sell.

Brand Heritage

Extech Instruments was founded in 1971 and became part of FLIR Systems in 2007; FLIR Systems itself was acquired by Teledyne Technologies in 2021. Instruments in this series may carry Extech, FLIR, or Teledyne FLIR branding depending on year of manufacture — all are the same product family and remain supported through the current corporate ownership.

Compare Other Models in This Series

The 475040-SD and 475044-SD are two members of a single product family that share an identical operator interface, datalogging architecture, RS-232/USB output, accessory kit, and physical form factor. The two models differ only in measurement range, resolution, accuracy specification, and mechanical overload limits — every other attribute is common to both units.

Selecting between the two models is a question of force range rather than feature tier. The 475040-SD is the correct choice for low-force work where 1 g resolution and 5000 g maximum capacity match the device under test. The 475044-SD is the correct choice when measured forces approach or exceed the 5 kg ceiling of the 475040-SD, with 10 g resolution and a 20.00 kg maximum capacity.

Each new model below is listed on its own product page with condition-matched pricing, shipping availability, and accessory inclusions. Click through to the specific model that matches your force range — the datasheet specifications and selection guidance on this page apply identically to both.

This page covers the 475040-SD specifically: 3 to 5000 g range, 1 g resolution on the gram scale, ±(0.4% of reading + 1 digit) accuracy specified at 3000 g and 5000 g, and a 7 kg maximum overload limit. Full-scale mechanical deflection is approximately 2 mm. Available measurement units on this model are g, oz, and N.

The headline differences between the two family members come directly from the datasheet specification table. The 475040-SD spans 3 to 5000 g (0.10 to 176.40 oz, or 0.03 to 49.03 N) at 1 g resolution with ±(0.4% Rdg + 1 digit) accuracy and 7 kg overload capacity. The 475044-SD spans 0.02 to 20.00 kg (0.07 to 44.10 lb, or 0.3 to 196.12 N) at 0.01 kg resolution with ±(0.5% Rdg + 2 digits) accuracy and 30 kg overload capacity.

Unit-selection options also differ to match the range: the 475040-SD offers g, oz, and N; the 475044-SD offers kg, lb, and N. Mechanical compliance differs as well — the 475040-SD shows approximately 2 mm of full-scale deflection at the sensing head, while the higher-capacity 475044-SD shows approximately 0.4 mm. The comparison table below summarizes these differences side by side.

Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below.

Accessories Supplied

• Flat-head Adapter
• Cone Adapter
• Chisel Adapter
• Hook Adapter
• 120 mm Extension Rod

Product Core & Specifications

Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.