China
A ratchet, and a specification described with the wrong word
Two instruments that illustrate both halves of this site’s argument in one brand.
The ratchet. Tolesum’s micrometer is the only one in its hub whose listing describes a ratchet control, and a ratchet is what makes a micrometer repeatable between two people — it closes the spindle at a fixed torque instead of at whatever force the operator applies.
The sound level meter states its accuracy with its reference conditions: ± 1.5 dB at 94 dB and 1 kHz, which is the correct form.
The micrometer listing calls 0.001 mm an accuracy. It is the display step. That is the clearest example in the catalog of resolution being described as precision.
The sound level meter, for stating its figure properly.
0–25 mm (0 to 0.98 in) · 0.001 mm display · ratchet stop · alloy head
A digital micrometer over 0–25 mm (0 to 0.98 in) with a ratchet control, and the clearest example in this hub of resolution being described as accuracy.
Best for: Repeatable measurements by more than one person, thanks to the ratchet.
30–130 dB · ± 1.5 dB at 94 dB / 1 kHz · A-weighted · fast and slow response
A 30 to 130 dB meter publishing its accuracy with the conditions it applies at — ± 1.5 dB at 94 dB and 1 kHz — with A-weighting and fast and slow response modes.
Best for: Getting a sense of a noise problem, with a figure whose conditions are stated.
