Table 3.

Comparison of the developed spirometer with commercial ones.

	MIR Spirobank II	SDI Diagnostics Astra 100	SpiroTube	GoSpio	Ours
Flow range and resolution	0–16 L/s	0–16 L/s	0–18 L/s	0–14 L/s	0–15 L/s
	200 mL/s	150 mL/s	8 mL/s	25 mL/s	4 mL/s
Working principle	Compact turbine	Bi-directional digital turbine	ultrasonic multiple-path	Bi-directional vertical turbine	Differential pressure
Size and weight	160 × 55 × 25	147 × 83 × 102	150 × 60 × 21	120 × 100 × 80	120 × 100 × 70
	145 g	250 g	141 g	300 g	260 g
Based on PC or smartphone	PC, iPad	PC	PC	PC or smartphone	Smartphone or PC/iPad
Wireless or not	Yes	Not	Yes	Yes	Yes
Cost	$795	$1978	$1950.95	$1395	~$100

* Detailed information of MIR Spirobank II [15], SDI Diagnostics Astra 100 [17], SpiroTube [22] and GoSpio [16] can be found in the cited references.