---
title: Calibration restore for Series 5 J157-J257-J357 & J457 Refractometers
description: To restore the Refractometers calibrations back to factory defaults, includes instructional video.
---

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# Calibration restore for Series 5 J157-J257-J357 & J457 Refractometers

## To restore the Refractometers calibrations back to factory defaults.

![](https://knowledge.rudolphresearch.com/hs-fs/hubfs/image-png-Apr-25-2024-02-42-44-3845-PM.png?width=670&height=821&name=image-png-Apr-25-2024-02-42-44-3845-PM.png)

![](https://knowledge.rudolphresearch.com/hs-fs/hubfs/image-png-Apr-25-2024-02-44-32-9687-PM.png?width=661&height=769&name=image-png-Apr-25-2024-02-44-32-9687-PM.png)

![](https://knowledge.rudolphresearch.com/hs-fs/hubfs/image-png-Apr-25-2024-02-45-05-4652-PM.png?width=659&height=763&name=image-png-Apr-25-2024-02-45-05-4652-PM.png)

**[Watch the Instructional Video](https://knowledge.rudolphresearch.com/hubfs/Refractometer%20Calibration%20Restore%20-%20customer.mp4?hsLang=en)**

 

 

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