GT5101 Digital Manometer, Dual-Port Manometer Gas Pressure Tester, Handheld Professional Air Pressure Meter, 13 Selectable Units Differential Pressure Gauge, with Large LCD Display Features: Professional Manometer: The Handheld Manometer is made of ABS material, and the excellent performance of high-temperature resistance and impact resistance makes the air pressure meter have a long service life. Adopts professionally designed, it has a wide range, high resolution and high measurement accuracy. 13 Selections of Measuring Unit: bar, mbar, KPa, Kgf/cm², mmHg, cmH₂O, Ozf/in², Psi, inHg, inH₂O, ftH₂O, Hpa, Pa Other Functions - Supports MAX/MIN/AVG measurement mode switching, date record/hold/clear, buzzer alarm, real-time date, barometric pressure zero calibration, battery level display. With large LCD screen, display data clearer and easier to read. Compact Size & Lightweight: Portable Digital Manometer comes with a nice storage box, easy to carry and keep. Compact size, suitable for handheld operation. Wide Applications: Widely used to measure fan and blower pressure, filter resistance, air speed, furnace pressure,orifice plate differential pressure, etc. It is also used for controlling the air to gas ratio and the automatic valve in combustion process, and monitoring blood pressure and respiratory pressure in medical care equipment. Specifications: Model:  GT5101-1KPa / GT5101-2KPa / GT5101-4KPa / GT5101-10KPa / GT5101- 40KPa / GT5101 _50KPa / GT5101-100KPa / GT5101-125Pa / GT5101 -250Pa (Optional) Pressure Range: ±1KPa / ±2KPa / ±4KPa / ±10KPa / ±40KPa / ±50KPa / ±100KPa / ±125Pa / ±250Pa (Optional) Standby Current: 3.5uA Working Current: 90mA(Turn off the buzzer when the lithium battery voltage is 4.2V) Power: 400mW(Turn off the buzzer alarm) Temperature Compensation Range: -5~50℃ Overload Pressure: X 3 FS Accuracy(Total Error): ±1%FS(Differential pressure gauge with range of greater than or equal to ±1Kpa range) ±2%FS(Differential pressure gauge with range of less than ±1Kpa) Operating Temperature Range: -10~60℃ Unit: bar, mbar, KPa, Kgf/cm², mmHg, cmH₂O, Ozf/in², Psi, inHg, inH₂O, ftH₂O, Hpa, Pa Power Supply: Built in a 3.7V 1000mAh lithium battery Charging Method: 5V1A USB Cable Charging Time: about 1.5h Working Time: about 13h Standby Time: Automatic shutdown when the voltage is lower than 2.9V about 8 months Protection Functions: overcharging and over-discharging Material: ABS Item Size: 162 * 63 * 32 mm / 6.38 * 2.48 * 1.26 inch Item Weight: 178g / 6.28oz Package Weight: 700g / 24.69oz Package Size: 27 * 21.2 * 6.5 cm / 10.63 * 8.35 * 2.56 inch Package List: 1 * Manometer 2 * Plastic Pipe 1 * USB Date Cable 1 * User Manual (English) 1 * Plastic Box