I received our first units of a new brand of dust monitors (Temtop instead of MetOne) that we are going to test replacing the current MetOne GTs with. I got 2 different units, the PMD331 (handheld,  remote capable, pump less option available) and the PMS21 (fixed remote monitoring, no internal battery pack, pump less option available). Fil made me a custom 24v power cable for the PMD331 using its 5 pin terminal block, as it didn't come with one.

Both of the dust monitors passed their zero count and flow rate calibration checks right out of the box, the PMS21 requires a password to get to the settings menu (543210).

I have them running in the corner of the control room for right now.

Their serials are as follows;

PMD331: TD3350722828

PMS21: TM2150918004