| 症状 | 問題 | アクション |
| 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 |
| バッテリー残量が少ない | 交換用バッテリー。 | |
| Display is blank | possible battery drain | Check and/or replace battery. |
| レーザーが機能しない | 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 | |
| 長いブザー | Is there a function to set High/Low, | Reset or cancel limit settings. |
| 測定値が制限を超えました |
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infrared thermometer ST490 製品リンク：
