Thanks to everyone who responded to my question. I've gone with Dick's suggestion of 'several devices' in this particular context, as 'devices' and 'instruments' are both used in the same document when referring to 'equipment'.
Out of curiousity I googled for 'equipments' and found several web sites for companies where 'equipments' appears in the company name (e.g., 'Elgi Equipments Ltd'). All but one of the links I followed were for companies located in India, so perhaps the occurrence of 'equipments' is due to poor translation.
Thanks again.
Gérald
Dick Margulis wrote:
>Equipments occurs mostly in legal language, sometimes seen in contracts.
>In the context you are talking about, use several devices, several
>machines, several {test} instruments, or several pieces of equipment.
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