Still some residual chems kicking about..!!

code/modules/reagents/chemistry/holder.dm

@@ -1,4 +1,4 @@
-#define CHEMICAL_QUANTISATION_LEVEL 0.0001
+#define CHEMICAL_QUANTISATION_LEVEL 0.001
 
 /proc/build_chemical_reagent_list()
 	//Chemical Reagents - Initialises all /datum/reagent into a list indexed by reagent id
@@ -745,7 +745,6 @@
 			del_reagent(R.id)
 		else
 			total_volume += R.volume
-
 	return 0
 
 /datum/reagents/proc/clear_reagents()

code/modules/reagents/chemistry/machinery/chem_master.dm

@@ -332,7 +332,7 @@
 				var/vol_part = min(reagents.total_volume, 30)
 				if(text2num(many))
 					amount_full = round(reagents.total_volume / 30)
-					vol_part = reagents.total_volume % 30
+					vol_part = ((reagents.total_volume*1000) % 30000) / 1000 //% operator doesn't support decimals.
 				var/name = stripped_input(usr, "Name:","Name your bottle!", (reagents.total_volume ? reagents.get_master_reagent_name() : " "), MAX_NAME_LEN)
 				if(!name || !reagents.total_volume || !src || QDELETED(src) || !usr.canUseTopic(src, !issilicon(usr)))
 					return