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Choose a Shore Durometer
Choosing a Shore durometer is about far more than analogue versus digital. Once Shore is established as the right method, the instrument still has to suit the scale the material needs, the shape of the specimen, how the reading will be reported and how much operator-to-operator variation the job can live with. Get those right and the durometer almost picks itself; get them wrong and even a good instrument produces numbers you cannot defend. This guide is about the handheld durometer itself — test stands and verification kit have guides of their own.
1. How to Choose
Start with the scale, not the display. The Shore scale the material actually needs is the decision that matters most, because it decides whether your readings land in the part of the range where the instrument can tell one material from another at all. With that settled, the rest follows:
- Analogue earns its place where simplicity and battery-free reliability matter most — a rugged dial for the shop floor that simply works.
- Digital is worth the extra outlay when you need timed readings, peak capture or output that drops straight into a report — the things that make a QA record defensible.
- If the result will ever back a tight-tolerance acceptance decision, plan for a stand alongside the handheld from the outset, rather than discovering later that hand pressure is the source of your scatter.
2. Typical Product Fits
Three instruments cover most of what buyers here actually need:
- AD-300 — analogue and multi-scale (Shore A, D, C, O, OO, DO), the straightforward choice for production and incoming checks where a battery-free dial is preferred.
- DD-300 — digital, with a 0–15 s timer, peak hold and RS232 output for the QA work that has to be timed, recorded and reported.
- AD-300L — analogue with a slim probe (Shore A and D) for the irregular shapes, recesses and hard-to-reach spots a standard foot cannot sit on.
3. Special Cases
A few situations are worth flagging before you order:
- For O-rings or thin sections, check the support geometry first — the anvil effect can bias a reading badly when the part is too thin or unsupported.
- For JIS or specialty rubber-scale work, confirm the specified scale and dwell time against ASTM D2240, ISO 868 or ISO 23529 before committing.
- For repeatable bench checks, a stand-style setup such as the RX-OS-2 takes operator force and approach speed out of the reading entirely.
4. Next Step
If controlled application force is part of the requirement, continue to Select a Durometer Test Stand. If the setup also needs block kits, fixtures or verification items, see Durometer Essentials.
5. Related Knowledge
- Shore Hardness — how the method works, if you want the background.
- Shore Hardness Scales — the detail behind choosing A, D, OO or M.
- Durometer Operating Principles — what is going on inside the instrument.