Sekonic ST-50M: Discontinued Model, Available Alternatives
The Sekonic ST-50M (ST50M) measured temperature and relative humidity while recording on paper charts and an SD memory card. This instrument is discontinued. Use the options below to choose a new recorder based on the type of record you need to keep.
Check the recording method before ordering: the Sigma II uses paper charts; the SK-L754 is an electronic datalogger. Neither option reproduces both ST-50M recording methods in one instrument. Chart paper, pens, sensors and memory cards for the ST-50M should not be assumed compatible with either Sato model.
Supplies for an Existing ST-50M
If your Sekonic recorder remains in service, you can shop its listed recording consumables separately:
Check the reference on your existing chart paper or pen packaging before purchase.
About the Original ST-50M
The ST-50M displayed temperature and humidity locally and supported paper chart recording alongside SD card storage. Historical ST-50M specifications are provided for identification; they describe the discontinued Sekonic instrument, not the Sato alternatives.

Sekonic ST-50 series image shown for identification.
For detailed information about the original instrument, read the ST-50M page on our main website.