Door Gap Measuring Tool, 1-15mm Fire Door Gap Gauge Checker Tool Engineering Ruler, Feeler Gauges for House Engineering Inspection Flatness Measuring Tool Ruler(0.5mm/0.2mm) (0.5mm)

Does the job and quality is good

In order to avoid problems with airport security, a plastic wedge would have been better but it does the job

Useful tool - good for periodic checks on fire doors to ensure no movement needs addressing. I wasn’t sure whether you take the reading from the narrow side or wider side of the slider as it doesn’t tell you on the device or packaging - an experienced fire door inspector, who uses a similar tool, told me it’s the measurement on the narrower side that’s relevant, i.e, the side of the slider that touches the door/ frame. Very easy to use and good value for money. I bought this one another wider one, shaped more like a credit card - using both helps confirm accuracy of the readings I found. Happy overall although I feel clear user instructions would be useful.

Exactly as it says works fine

Its not accurate

Better than the usual plastic door gap and much more accurate.

Fair item, I was expecting a bit more functionality then this but its dine not bad. The compatibility is fairly good as well

As required