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Manufacturer-discontinued — available only while our remaining stock lasts. The Sekonic ST-50A (ST50A) displays temperature and humidity digitally while recording both readings on a paper chart.
A practical choice if you need another ST-50A to match an existing installation. The standard set includes one chart, a red recording pen and a blue recording pen. Replacement chart paper and recording pens are listed separately.
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Final SL stock: Sekonic has ended sales of the ST-50A. This listing is for remaining units already held by SL, subject to availability. The ST-50A combines a digital temperature and humidity display with a continuous, visible paper-chart record for rooms, laboratories, warehouses and production areas.
| Model | Sekonic ST-50A (ST50A) |
|---|---|
| Recording method | Temperature and humidity on Z-fold paper chart |
| Measurement range | Temperature: −20 to 80°C; relative humidity: 0 to 100% RH |
| Chart speeds / recording periods | 20 mm/h / 25 days; 10 mm/h / 50 days; 5 mm/h / 100 days; 2.5 mm/h / 200 days |
| Chart format | Approximately 113.5 mm wide, with 100 mm effective recording scale |
| Recording colours | Red for temperature; blue for humidity |
| Power | Four LR20 (D-size) 1.5 V batteries; compatible AC adapter connection |
| Dimensions | 300 × 245 × 105 mm |
| Included with standard set | Four LR20 batteries, one chart and one red/blue recording pen |
| Digital data storage | None on ST-50A; this is the paper-chart model |
| Item | Reference | Supply |
|---|---|---|
| Sensor extension cable, 5 m | HE04 | Optional |
| Sensor extension cable, 20 m | HE05 | Optional |
| Sensor extension cable, 50 m | HE06 | Optional |
| External control output unit | HE09 | Optional |
| Standard chart paper | HE12 / HEGA / HE0140010 | 5 charts per pack |
| Clean chart paper | HE11 | 5 charts per pack |
| Recording pens | HE13 / HEFA / HEFA15330 | 2 red + 2 blue per pack |
Already operating an ST-50A? Order replacement chart paper or replacement pen for continued recording. Check the reference on your existing supply before ordering.
For further reading, see the Sekonic ST-50 series product page and Sekonic’s ST-50A end-of-sales notice.
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Manufacturer-discontinued — available only while our remaining stock lasts. The Sekonic ST-50A (ST50A) displays temperature and humidity digitally while recording both readings on a paper chart.
A practical choice if you need another ST-50A to match an existing installation. The standard set includes one chart, a red recording pen and a blue recording pen. Replacement chart paper and recording pens are listed separately.
Keep your Sekonic ST-50A or ST-50M recording temperature and humidity on paper. This standard HEGA chart paper has a −20 to 80°C temperature scale and a 0 to 100% RH humidity scale. One box contains five pads.
Also listed under the HE12 and HE0140010 references. Check the chart reference and printed scale used by your recorder before ordering. Recording pens are sold separately.
Keep your Sekonic ST-50A or ST-50M chart recording clearly with replacement HEFA recording pens. Each pack contains two red temperature pens and two blue humidity pens.
Four pens per pack. Also listed under HE13 and HEFA15330 references. Chart paper is sold separately; check the pen reference used by your recorder before ordering.
The Dickson SL4100 records temperature on a 4-inch circular chart while showing the current reading on its LCD. Select a 24-hour or 7-day chart rotation to suit your monitoring schedule.
Humidity and temperature at a glance. The Sato Highest I (7540-00) pairs a precision hair hygrometer with a glass thermometer in one easy-to-read instrument. Check 20–100% RH and −10 to 50°C during routine indoor inspections, without batteries or a data logger.
Check heat conditions at worksites, sports facilities and outdoor activity areas with the Sato SK-170GT WBGT monitor. Its built-in black globe accounts for radiant heat while the instrument displays WBGT, air temperature, globe temperature and relative humidity.
Choose indoor or outdoor measurement mode, set a WBGT alarm and review maximum or minimum readings. One 9 V battery and a hard carrying case are included.
Record temperature and humidity with the Sato SK-L754 data logger. Choose the probe position that suits your installation: SK-L754-1 plugs directly into the logger, while SK-L754-2 has a 1.6 m cable so the sensing tip can be positioned away from it.
Select your probe before adding to cart. Each option includes one SK-L754 logger and one selected probe. Price and availability update with your choice. The logger stores up to 16,000 readings per channel for later PC review.
Check temperatures, save readings and receive an audible alert when a set limit is reached. This Sato SK-1260 set includes the SK-S100K Type K probe for liquids, viscous liquids and semisolid materials.
The supplied probe is rated from −100 to 300°C; the meter displays readings from −99.9°C with this probe. The set also includes four AAA batteries, a carrying pouch and an instruction manual. Other probes and the printer are sold separately.
See the current, highest and lowest temperature together with the Sato PC-3500 digital thermometer. Connect its supplied 3 m probe to measure away from the display, or disconnect it to use the built-in sensor.
Manufacturer-discontinued; available while remaining stock lasts. This listing is for the PC-3500 (Cat. No. 1740-50) with its external probe and LR44 battery. Press RESET when starting a new monitoring period or switching measurement locations.
Record up to six measurement points on one paper chart with the Sekonic SP-100 portable hybrid recorder. Configurable inputs support thermocouples, resistance thermometers, DC voltage and current measurement.
Manufacturer-discontinued; offered from remaining stock. The chart gives operators a visible record on site. Temperature sensors, a current-input shunt and the optional memory-card unit must be selected separately as required for your application.
Isuzu TH27R is discontinued. For a new temperature and humidity paper chart recorder, choose the Sato Sigma II 7210-00 or 7211-00 according to the temperature range you need. This TH27R page is retained to help identify existing instruments and their consumables; the TH27R itself is no longer available to order.
Check room temperature and humidity at a glance with the Sato Highest II 7542-00. A clear analog dial shows relative humidity, while a separate digital display shows temperature to 0.1°C.
The supplied bracket makes wall installation straightforward. Ideal for local room checks where staff need visible readings without connecting a computer or changing chart paper.
Take quick contact temperature readings with the compact Sato PC-9215 (1747-00). Its fixed stainless-steel probe measures from −50 to 150°C, while MAX/MIN and HOLD functions make readings easier to review.
This is the original drip-proof PC-9215, supplied with a clip-on probe sheath and an LR1130 button battery. Check the model number if you are replacing a PC-9215II; the two versions have different specifications.
Sekonic ST-50M (ST50M) is discontinued. This model combined temperature and humidity paper chart recording with SD card data storage. For a new instrument, shop Sato Sigma II for paper charts or shop Sato SK-L754 for electronic logging. Existing ST-50M users can still order compatible chart paper and recording pens below.
Sato PC-5410TRH is a digital temperature and humidity meter with a large LCD for checking indoor conditions at a glance. Current readings and the highest and lowest values are displayed together.
Check temperatures in food preparation, production and laboratory work with the Sato SK-270WP-K. This ready-to-use set includes the S270WP-01 standard probe, which measures from −40.0 to 250.0°C.
The thermometer starts measuring when switched on and has a HOLD function for reading the display. Its body is IP67 rated when the probe is correctly connected. Two AAA batteries, a neck strap and a protective vinyl cover are included.
Keep a visible paper record of temperature and humidity with the Sato Sigma II NSII-Q thermohygrograph. Its clear cover lets you check the chart at a glance, while the quartz clock supports 1-day, 7-day or 32-day recording.
Choose your temperature range: 7210-00 measures −15 to 40°C; 7211-00 measures −10 to 50°C. Both measure 0 to 100% RH. Select the model that matches your site conditions before adding to cart.
Keep your existing Sato SK-L200THIIα temperature and humidity datalogger in service. Choose the SK-LTHIIα-1 plug-in probe or the SK-LTHIIα-2 remote probe with 1.5 m cable. Each option is one replacement probe only; the discontinued logger is not included.
Select your probe model to see its price and stock status. These legacy probes are not interchangeable with probes for the newer SK-L754 datalogger.
Compact logging for temperature and humidity. The testo 174H monitors indoor conditions with two built-in sensors, an easy-to-read display and memory for up to 16,000 readings. Ideal for storage rooms, archives and routine environmental checks. This listing is for the logger only: a compatible USB interface is required to set it up and download data.
