| Symptom | Problem | Aktion |
| OL (on display) | Target temperature out of range | Select a target within the metric range |
| -OL(on display) | Target temperature below range | Select a target within the metric range |
| niedriger Batteriestatus | Ersatzbatterie. | |
| Display is blank | possible battery drain | Check and/or replace battery. |
| Laser funktioniert nicht | 1. Low battery or dead battery | 1. Replace the battery. |
| 2. The ambient temperature is higher than 40 degree (104 degree F) | 2. Suitable for areas with low ambient temperature | |
| langer Summer | Is there a function to set High/Low, | Reset or cancel limit settings. |
| und der Messwert hat den Grenzwert überschritten |
Pls Clink Below Photo and Read more details about this infrared thermometer ST490
infrared thermometer ST490 Produktlink:
