Sekonic HEFA Recording Pens for ST-50A and ST-50M
Refresh both recording channels of your Sekonic thermohygrograph with one convenient pen pack. The red pens trace temperature, while the blue pens trace humidity on the recorder chart.
What’s in the Pack
| Pen reference |
HEFA; also listed as HE13 / HEFA15330 |
| Compatible recorders |
Sekonic ST-50A and ST-50M |
| Red temperature pens |
2 pieces |
| Blue humidity pens |
2 pieces |
| Total supplied |
4 pens per pack |
| Chart paper |
Not included; sold separately |
Before ordering: Match the pen reference and recorder model against your existing consumables. This listing is for the complete red-and-blue pen pack, not a single pen.

Changing the paper as well? Shop Sekonic ST-50 chart paper. For recorder details and consumable references, read the main SL ST-50A product page or main SL ST-50M product page.