---
product_id: 133641184
title: "THEMISTO - built with passion Clear Acrylic Case Shell Housing With W1209 Digital LED DC 12V Temp Thermostat Temperature Control Switch Module Controller Board"
brand: "themisto"
price: "₩15796"
currency: KRW
in_stock: true
reviews_count: 8
category: "Themisto"
url: https://www.desertcart.kr/products/133641184-themisto-built-with-passion-clear-acrylic-case-shell-housing-w1209
store_origin: KR
region: South Korea
---

# Precise 0.1°C control accuracy Customizable multi-parameter settings Wide temp range -50~110°C THEMISTO - built with passion Clear Acrylic Case Shell Housing With W1209 Digital LED DC 12V Temp Thermostat Temperature Control Switch Module Controller Board

**Brand:** themisto
**Price:** ₩15796
**Availability:** ✅ In Stock

## Summary

> 🌟 Take control of your environment like a pro — precision meets passion!

## Quick Answers

- **What is this?** THEMISTO - built with passion Clear Acrylic Case Shell Housing With W1209 Digital LED DC 12V Temp Thermostat Temperature Control Switch Module Controller Board by themisto
- **How much does it cost?** ₩15796 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/133641184-themisto-built-with-passion-clear-acrylic-case-shell-housing-w1209)

## Best For

- themisto enthusiasts

## Why This Product

- Trusted themisto brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Plug & Play Power:** Runs on 12V DC with relay support for up to 250V 5A loads — perfect for professional setups.
- • **Smart Customization:** Tailor hysteresis, trigger delay, and alarm limits to fit your exact needs.
- • **Durable & Clear Design:** Sleek clear acrylic case housing combines industrial strength with modern aesthetics.
- • **Versatile Control Range:** From freezing -50°C to scorching 110°C, adapt to any environment or project.
- • **Precision Temperature Mastery:** Maintain your ideal climate with 0.1°C accuracy for flawless control.

## Overview

THEMISTO is a high-precision digital thermostat controller featuring a wide temperature range (-50 to 110°C) and 0.1°C resolution. Housed in a clear acrylic case, it offers customizable parameters including hysteresis, trigger delay, and temperature offset correction. Powered by 12V DC, it supports relay switching for loads up to 250V 5A, making it ideal for industrial, scientific, and home automation applications requiring reliable temperature regulation.

## Description

THEMISTO - built with passion Clear Acrylic Case Shell Housing With W1209 Digital LED DC 12V Temp Thermostat Temperature Control Switch Module Controller Board : desertcart.in: Industrial & Scientific

Review: Good quality - This one is good use as Thermo contoller I ordered two and used them. I have adjusted to 33 degree C and it maintains temperature from 31 to 33 degree C. I use it for curdling milk or ferment the atta for idli during cold season. Again I ordered two, but one wrong item sent. Anyhow I am keeping it.
Review: No datasheet in box or description and it needs calibration - First of all datasheet should be included in box which is not there. Anyways I am including function understanding in image and at the end of this review. I read in one review that it exploded after connecting it with power, there was wrong power connection that I can see in the review's photo so I am clearing this, Supply only 12V DC to the module, there is +12V and GND clearly written on the PCB. You can connect up to 250V 5Amp AC load to it, K0 and K1 is the relay connections for operating the load. The PCB is on thinner side but overall quality is good. Will see how it performs in the long run. The acrylic case comes separate in parts and you need to assemble it. They should provide extra screw-nuts in case there is some problem with threads or someone loses it. It would be great if it operated on 5V DC, we could use a mobile charger as a power supply. There is a need to calibrate the module, mine had +2.3 degree C error, I have one very simple way to calibrate if you have nothing in your home to calibrate the module with. 1. Take a medical thermometer, put it in your mouth, take its reading after a minute or two and remember it. 2. Put temp. probe in your mouth while module is on, give some time to stable the reading in display. 3. See the reading, if does not match with thermometer, use function P4 adjust temp to the correct value (put the diff. b/w display reading and thermometer reading) and match it with thermometer reading (Keep temp probe in your mouth all the time while doing this) 4. Calibration is done. Understanding functions: 1. Setting the trigger temperature: To set the trigger temperature press the button marked 'SET'. The seven segment display will flash. You can now set a trigger temperature (in oC) using the '+' and '-' buttons in 0.1 degree increments. If no buttons are pressed for approximately 2 seconds the trigger temperature will be stored and the display will return back to the current temperature. 2. Setting the parameters: To set any parameter first long press the 'SET' button for at least 5 seconds. The seven segment display should now display 'P0'. This represents parameter P0. Pressing the '+' or '-' buttons will cycle though the various parameters (P0 to P6). Pressing the 'SET' button whilst any of there parameters are displayed will allow you to change the value for that parameter using the '+' and '-' buttons (see below). When finished setting a parameter press the set button to exit that option. If no buttons are pressed for approximately 5 seconds the thermostat will exit the parameter options and will return back to the default temperature display. 3. Setting the cooling or heating parameter P0: The parameter P0 has two settings, C and H. When set to C (default) the relay will energise when the temperature is reached. Use this setting if connecting to an air-conditioning system. When set to H the relay will de-energise when the temperature is reached. Use this setting if controlling a heating device. 4. Setting the hysteresis parameter P1: This sets how much change in temperature must occur before the relay will change state. For example if set to the default 2oC and the the trigger temperature has been set to 25oC, it will not deenergise until the temperature falls back below below 23oC. Setting this hysteresis helps stop the thermostat from continually triggering when the temperature drifts around the trip temperature. 5. Setting the upper limit of the thermostat parameter P2: This parameter limits the maximum trigger temperature that can be set. It can be used as a safety to stop an excessively high trigger temperature from accidentally being set by the user. 6. Setting the lower limit of the thermostat parameter P3: This parameter limits the minimum trigger temperature that can be set. It can be used as a safety to stop an excessively low trigger temperature from accidentally being set by the user. 7. Setting temperature offset correction parameter P4: Should you find there is a difference between the displayed temperature and the actual temperature (for instance if the temperature probe is on a long run of cable) you can make minor corrections to the temperature reading with this parameter. 8. Setting the trigger delay parameter P5: This parameter allows for delaying switching of the relay when the trigger temperature has be reached. The parameter can be set in one minute increments up to a maximum of 10 minutes. 9. Setting the high temperature alarm parameter P6: Setting a value for this parameter will cause the relay to switch off when the the temperature reaches this setting. The seven segment display will also show '---' to indicate an alarm condition. The relay will not re-energise until the temperature falls below this value. The default setting is OFF.

## Features

- Control range: -50 ~ 110
- Resolution: -9.9-99.9 0.1 , other temperature ranges 1
- Measuring inputs: NTC (10K 0.5%) Waterproof sensor 0.5M
- Environmental requirements: -10-60 , humidity 20% -85%
- Control accuracy: 0.1

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07RL2PVL4 |
| Best Sellers Rank | #7,113 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Thermostat Controllers |
| Country of Origin | China |
| Customer Reviews | 3.8 3.8 out of 5 stars (638) |
| Date First Available | 6 May 2019 |
| Display Type | LED |
| Importer | Aptechdeals ; B-1/7 Nanhey Park Uttam Nagar New Delhi- 110059; support@aptechdeals.com ;88106-13060 |
| Included Components | W1209 With Case |
| Item Dimensions LxWxH | 50 x 50 x 110 Millimeters |
| Item Height | 11 Centimeters |
| Item Weight | 80 g |
| Item Width | 50 Millimeters |
| Item model number | AP-R11A134 |
| Manufacturer | JIPVI TOOLS PVT LTD ;Third floorTaishi Plaza GUANZHOU China - 510040;hone number : 9599559766, jipvi tools |
| Model number | AP-R11A134 |
| Net Quantity | 1 Count |
| Number of Memory Sticks | 1 |
| Packer | Aptechdeals ; B-1/7 Nanhey Park Uttam Nagar New Delhi- 110059; support@aptechdeals.com ;88106-13060 |
| Power Source | Battery Powered |
| Product Dimensions | 5 x 5 x 11 cm; 80 g |
| Special Feature | Waterproof |
| Specific Product Use | Electric Baseboard Heater |

## Product Details

- **Brand:** THEMISTO
- **Colour:** Multicolour
- **Item Weight:** 80 Grams
- **Material:** Acrylic
- **Voltage:** 12 Volts

## Images

![THEMISTO - built with passion Clear Acrylic Case Shell Housing With W1209 Digital LED DC 12V Temp Thermostat Temperature Control Switch Module Controller Board - Image 1](https://m.media-amazon.com/images/I/81JDv598eCL.jpg)

## Questions & Answers

**Q: Can it be kept inside the freezer to control the temperature ?**
A: No

**Q: What does this device do?  Description just says that after you set it up, "the temperature will automatically execute".  Say what???**
A: It control temperature

**Q: sensor included or not**
A: Yes!!

**Q: has anybody tried used this product connected with Computer fan to reduce water temperature in an aquarium.**
A: No I just useing incubator temperature maintain

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good quality
*by R***A on 24 September 2025*

This one is good use as Thermo contoller I ordered two and used them. I have adjusted to 33 degree C and it maintains temperature from 31 to 33 degree C. I use it for curdling milk or ferment the atta for idli during cold season. Again I ordered two, but one wrong item sent. Anyhow I am keeping it.

### ⭐⭐⭐⭐ No datasheet in box or description and it needs calibration
*by S***R on 24 February 2022*

First of all datasheet should be included in box which is not there. Anyways I am including function understanding in image and at the end of this review. I read in one review that it exploded after connecting it with power, there was wrong power connection that I can see in the review's photo so I am clearing this, Supply only 12V DC to the module, there is +12V and GND clearly written on the PCB. You can connect up to 250V 5Amp AC load to it, K0 and K1 is the relay connections for operating the load. The PCB is on thinner side but overall quality is good. Will see how it performs in the long run. The acrylic case comes separate in parts and you need to assemble it. They should provide extra screw-nuts in case there is some problem with threads or someone loses it. It would be great if it operated on 5V DC, we could use a mobile charger as a power supply. There is a need to calibrate the module, mine had +2.3 degree C error, I have one very simple way to calibrate if you have nothing in your home to calibrate the module with. 1. Take a medical thermometer, put it in your mouth, take its reading after a minute or two and remember it. 2. Put temp. probe in your mouth while module is on, give some time to stable the reading in display. 3. See the reading, if does not match with thermometer, use function P4 adjust temp to the correct value (put the diff. b/w display reading and thermometer reading) and match it with thermometer reading (Keep temp probe in your mouth all the time while doing this) 4. Calibration is done. Understanding functions: 1. Setting the trigger temperature: To set the trigger temperature press the button marked 'SET'. The seven segment display will flash. You can now set a trigger temperature (in oC) using the '+' and '-' buttons in 0.1 degree increments. If no buttons are pressed for approximately 2 seconds the trigger temperature will be stored and the display will return back to the current temperature. 2. Setting the parameters: To set any parameter first long press the 'SET' button for at least 5 seconds. The seven segment display should now display 'P0'. This represents parameter P0. Pressing the '+' or '-' buttons will cycle though the various parameters (P0 to P6). Pressing the 'SET' button whilst any of there parameters are displayed will allow you to change the value for that parameter using the '+' and '-' buttons (see below). When finished setting a parameter press the set button to exit that option. If no buttons are pressed for approximately 5 seconds the thermostat will exit the parameter options and will return back to the default temperature display. 3. Setting the cooling or heating parameter P0: The parameter P0 has two settings, C and H. When set to C (default) the relay will energise when the temperature is reached. Use this setting if connecting to an air-conditioning system. When set to H the relay will de-energise when the temperature is reached. Use this setting if controlling a heating device. 4. Setting the hysteresis parameter P1: This sets how much change in temperature must occur before the relay will change state. For example if set to the default 2oC and the the trigger temperature has been set to 25oC, it will not deenergise until the temperature falls back below below 23oC. Setting this hysteresis helps stop the thermostat from continually triggering when the temperature drifts around the trip temperature. 5. Setting the upper limit of the thermostat parameter P2: This parameter limits the maximum trigger temperature that can be set. It can be used as a safety to stop an excessively high trigger temperature from accidentally being set by the user. 6. Setting the lower limit of the thermostat parameter P3: This parameter limits the minimum trigger temperature that can be set. It can be used as a safety to stop an excessively low trigger temperature from accidentally being set by the user. 7. Setting temperature offset correction parameter P4: Should you find there is a difference between the displayed temperature and the actual temperature (for instance if the temperature probe is on a long run of cable) you can make minor corrections to the temperature reading with this parameter. 8. Setting the trigger delay parameter P5: This parameter allows for delaying switching of the relay when the trigger temperature has be reached. The parameter can be set in one minute increments up to a maximum of 10 minutes. 9. Setting the high temperature alarm parameter P6: Setting a value for this parameter will cause the relay to switch off when the the temperature reaches this setting. The seven segment display will also show '---' to indicate an alarm condition. The relay will not re-energise until the temperature falls below this value. The default setting is OFF.

### ⭐⭐⭐⭐⭐ Awesome Quality and Performance
*by M***G on 14 May 2023*

Its quality is very good its performance is superb and most importantly its setting point is very stable there is no fluctuation at all If you want to set it above -20 ° then it can be set in points it will not be visible but you can set it by counting and this executive works on the same point

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*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-03-07*