The inner tank is made of high-quality mirror stainless steel, which has the characteristics of corrosion resistance, acid resistance, easy cleaning and no rust. Microcomputer intelligent temperature controller, P.I.D. and stable temperature control, high precision, 11 bit LED high brightness digital display, intuitive and clear, with good control ability and anti-interference ability. Double temperature safety device: the temperature controller has automatic tracking and overtemperature alarm device; In case of overtemperature, the heating system shall be cut off immediately, and a temperature safety device shall be installed in the working room to ensure the safety of the culture in the working room. The unique air duct design of the studio ensures the uniformity and accuracy of the temperature in the box. Three side lighting design, five levels of illuminance adjustable, simulating the environment of day and night. Double door structure: after the outer door is opened, observe the laboratory experiment through the inner door made of high-strength tempered glass, and the temperature and humidity are not affected. The shelf in the studio is made of stainless steel, and the height can be adjusted at will. The independent temperature limit alarm system automatically interrupts when the temperature exceeds the limit to ensure the smooth progress of the experiment (optional). It can be equipped with printer or RS-485 interface to connect the computer to record the changes of temperature, humidity and other parameters (optional).

Serial number	project	technical parameter
1	Product symbol	SPTCQH-250-03	SPTCQH-300-03	SPTCQH-400-03
2	Volume	250L	300L	400L
3	Heating / cooling mode	Stainless steel electric heater / totally enclosed compressor (optional fluorine free)）
4	temperature range	Illumination 5 ℃ - 50 ℃No light 0 ℃ - 50 ℃
5	Temperature resolution	0.1℃
6	Temperature fluctuation	± 0.5 ℃ (heating operation state)± 1 ℃ (refrigeration operation state)
7	Humidity control range	50-95% Humidity control fluctuation ±5%RH（25℃-40℃）
8	Humidification mode	External ultrasonic humidifier
9	Illuminance	0-15000Lx	0-20000Lx	0-25000Lx
10	work environment	20±5℃
11	Number of shelves	Three
12	cryogen	R22（Common type）/ 404A（Fluorine free environmental protection type）
13	working hours	1-99 hours or continuous
14	Power	1400W	1750W	1850W
15	Working power supply	AC  220V 50Hz
16	Studio size mm	570×500×850	570×540×950	700×550×1020
17	Overall dimension mm	770×735×1560	780×780×1700	920×825×1800

The "H" is fluorine-free environmental protection type, and the fluorine-free compressor adopts imported international brand compressor.