On 8/27/2016 8:54 PM, michael adams wrote:
"fred" wrote in message
...
On Saturday, August 27, 2016 at 3:29:09 PM UTC+1, Peter Parry wrote:
On Fri, 26 Aug 2016 04:05:56 -0700 (PDT), fred
wrote:

I want to measure the width of a groove which is only about 3.5mm wide and 1-3 mm
deep.
Ordinary Mitutoyo calipers with pointed tips are not much good for this application
due to the shallow nature of the groove.

Use a measuring magnifier such as
https://www.emsdiasum.com/microscopy...measuring.aspx

i like the sound of that.

Will investigat further

Many thanks

Yup sure sounds good to me.

Spend £68 on a magnifier

I picked up a second hand one on eBay for much less than that (but in
truth it has not had much use).

That said, I'd probably go for a drill bit plus feeler gauges.