---
title: "What if the test strip result doesn’t match a pre-set color/ppm value?"
description: "Use the app’s cropping tool to refine the image, or manually select the closest matching value."
url: https://help.fernox.app/en/articles/97-what-if-the-test-strip-result-doesn-t-match-a-pre-set-colorppm-value
collection: "Testing Samples"
updated: 2026-10-05
language: en
alternates: [es, de, fr, nl, fr-be, nl-be, pl, cs, ro, sv, sk, tr]
---

# What if the test strip result doesn’t match a pre-set color/ppm value?

Use the app’s cropping tool to refine the image, or manually select the closest matching value.