Hi,
Metrologic doesn't have an online warranty checking facility, but you can contact them by phone and request them to check it.
You will need to have as much of the following information as possible ready for when you speak to them:
Customer ID
Product Type
Serial Number / Date Code / Dated Proof of Purchase.
Ideally have the barcode scanner with you while on the phone so that if they ask you to check for specific serial numbers or codes you have it readily available.
They have multiple contact centers, as I'm not sure what location you are in, please take a look at their website link below to get the phone number for your area.
Most common number: +44(0) 1 925 240055 - United Kingdom.
http://www.honeywellaidc.com/Site.aspx/eu/en/contact/locations/