Membrapor PH3 gas sensors are available in different sizes and models.
Compact Phosphine sensors:
PH3/C-1000,PH3/C-2000,PH3/C-4000,PH3/C-5
Miniature Phosphine sensors:
PH3/M-20,PH3/M-200,PH3/M-2000,PH3/M-5