diff --git a/code/modules/reagents/Chemistry-Machinery.dm b/code/modules/reagents/Chemistry-Machinery.dm
index 6da1a73332c..5778628dbfd 100644
--- a/code/modules/reagents/Chemistry-Machinery.dm
+++ b/code/modules/reagents/Chemistry-Machinery.dm
@@ -364,7 +364,7 @@
 
 			if(href_list["amount"])
 				var/id = href_list["add"]
-				var/amount = text2num(href_list["amount"])
+				var/amount = isgoodnumber(text2num(href_list["amount"]))
 				R.trans_id_to(src, id, amount)
 
 		else if (href_list["addcustom"])
@@ -378,7 +378,7 @@
 
 			if(href_list["amount"])
 				var/id = href_list["remove"]
-				var/amount = text2num(href_list["amount"])
+				var/amount = isgoodnumber(text2num(href_list["amount"]))
 				if(mode)
 					reagents.trans_id_to(beaker, id, amount)
 				else
@@ -542,18 +542,10 @@
 
 /obj/machinery/chem_master/proc/isgoodnumber(var/num)
 	if(isnum(num))
-		if(num > 200)
-			num = 200
-		else if(num < 0)
-			num = 1
-		else
-			num = round(num)
-		return num
+		return Clamp(round(num), 0, 200)
 	else
 		return 0
 
-
-
 /obj/machinery/chem_master/condimaster
 	name = "CondiMaster 3000"
 	condi = 1