How can we help?

Choosing an instrument

Start with the measurement you need: course distance, outdoor landmarks, surface-temperature patterns, room dimensions or suitable liquid samples. Our product categories explain the differences, and the model finder offers a useful starting point.

For a technical question, keep the exact model designation and selected configuration available. Similar-looking products may have different controls, units or compatibility requirements.

Instructions and first use

Visit manuals and care for the manufacturer’s instruction directory. Follow the booklet and product label supplied with your unit. Do not transfer a button sequence from another model without checking.

An existing order

Open the order in the account used at checkout. That record contains the seller, delivery estimate, tracking and available return or assistance options. Keep the order number and product model ready when contacting the seller.

This website does not process payments or hold your order record. Our orders and returns guide explains the next steps.

Website questions

For a broken link, an accessibility issue or a question about information on these pages, write to optics@revasri-us.com. Include the page address and the relevant model. Please do not email payment-card details or passwords.

For product warranty or technical service, use the support information supplied with the product or the seller contact shown in your order.