Table 1.

Specifications of direct-reading Instruments.

	PDM3700a	pDR-1500b
Cost	$17000	$6000
Size (L × W × H)	8.3 cm × 24.3 cm × 17.2 cm	8.4 cm × 14.3 cm × 18.1 cm
Weight	2.0 kg	1.2 kg
Sampling flow	2.2 Lpm	1.0–3.5 Lpm
Concentration range	0–200 mg m−3	0.001–400 mg m−3
Cut-point diameter	4.0 µm	1.0–10 µm
Cyclone	Higgins-Dewellc	SCC 1.062 or GK 2.05
Resolution	0.01 mg m−3	0.1% of reading or 0.001 mg m−3, whichever is larger

^aThermo, 2016.

^bThermo, 2014.

^cVolkwein et al., 2006.