---
title: Testing your FINCH Display with a Coaxial Probe
description: When your tank is empty, you need to verify that your FINCH display is programmed correctly. If you are using a coaxial probe, you can test this using a simple tool such as a metal wire or screwdriver
---
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# Testing your FINCH Display with a Coaxial Probe
### Background:
When your tank is empty, you need to verify that your FINCH display is programmed correctly. If you are using a coaxial probe, you can test this using a simple tool such as a metal wire or screwdriver.
When your tank is empty, the FINCH display will typically show **2Lo,** meaning there is little or no liquid in the tank. However, to ensure that your display is calibrated and functioning correctly, you can simulate liquid levels manually.
The coaxial probe is designed with small holes spaced approximately one foot apart along the length of the rod. These holes are key to testing the display, as they allow you to simulate different liquid levels within the tank.
### Testing the FINCH Display
To test the system:
1. **Choose a starting point**: Select any hole along the coaxial probe.
2. **Insert a tool**: Insert a metal wire or a screwdriver through the chosen hole. This simulates the presence of liquid in the tank at that specific height.
3. **Observe the display**: Once the tool is inserted, the FINCH should display a volume measurement. The reading will correspond to the liquid level associated with the depth where the tool was inserted.
- For example, if you insert the screwdriver at the third hole from the bottom, the display should show the value programmed for that height. This verifies that the transmitter is reading the correct volumes and the system is working as expected.
### Testing Tip
For best results, you can test multiple holes along the length of the probe to ensure that the FINCH display responds accurately at different heights. If the display shows consistent readings based on where the tool is inserted, the system is functioning correctly. If any discrepancies are found, you may need to recalibrate or reprogram the transmitter.
---
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