Final testing. Added pH meter too. Compile safe.

code/modules/mob/living/simple_animal/friendly/cat.dm

@@ -372,7 +372,7 @@
 /datum/reagent/fermi/secretcatchem //Should I hide this from code divers? A secret cit chem?
 	name = "secretcatchem" //an attempt at hiding it
 	id = "secretcatchem"
-	description = "An illegal and hidden chem that turns people into cats/catgirls. It's said that it's so rare and unstable that having it means you've been blessed."
+	description = "An illegal and hidden chem that turns people into cats. It's said that it's so rare and unstable that having it means you've been blessed."
 	taste_description = "hairballs and cream"
 	color = "#ffc224"
 	var/catshift = FALSE

code/modules/research/designs/misc_designs.dm

@@ -456,6 +456,17 @@
 	category = list("Equipment")
 	departmental_flags = DEPARTMENTAL_FLAG_SCIENCE | DEPARTMENTAL_FLAG_ENGINEERING
 
+/datum/design/pHmeter
+	name = "pH meter"
+	desc = "A a electrode attached to a small circuit box that will tell you the pH of a solution."
+	id   = "pHmeter"
+	build_type = PROTOLATHE
+	materials = list(MAT_METAL = 1000, MAT_SILVER = 100, MAT_DIAMOND = 100)
+	build_path = /obj/item/pHmeter
+	category = list("Equipment")
+	departmental_flags = DEPARTMENTAL_FLAG_MEDICAL
+
+
 /////////////////////////////////////////
 ////////////Armour//////////////
 /////////////////////////////////////////

code/modules/research/techweb/all_nodes.dm

@@ -69,7 +69,7 @@
 	display_name = "Advanced Biotechnology"
 	description = "Advanced Biotechnology"
 	prereq_ids = list("biotech")
-	design_ids = list("piercesyringe", "crewpinpointer", "smoke_machine", "plasmarefiller", "limbgrower", "defibrillator", "meta_beaker", "healthanalyzer_advanced","harvester","holobarrier_med")
+	design_ids = list("piercesyringe", "crewpinpointer", "smoke_machine", "plasmarefiller", "limbgrower", "defibrillator", "meta_beaker", "healthanalyzer_advanced","harvester","holobarrier_med", "pHmeter")
 	research_costs = list(TECHWEB_POINT_TYPE_GENERIC = 2500)
 	export_price = 5000
 

modular_citadel/code/modules/reagents/chemistry/reagents/fermi_reagents.dm

@@ -1564,6 +1564,10 @@ And as stated earlier, this chem is hard to make, and is punishing on failure. Y
 	else if (pH >= 7)
 		pH = 7
 	holder.pH = ((holder.pH * holder.total_volume)+(pH * src.volume))/(holder.total_volume + src.volume) //Shouldn't be required
+	var/list/seen = viewers(5, get_turf(my_atom))
+	for(var/mob/M in seen)
+		to_chat(M, "<span class='warning'>The beaker fizzes as the buffer's pH changes!</b></span>")
+	playsound(get_turf(holder), 'modular_citadel/sound/FermiChem/bufferadd.ogg', 50, 1, -1)
 	holder.remove_reagent(src.id, 1000)
 	..()
 
@@ -1586,5 +1590,9 @@ And as stated earlier, this chem is hard to make, and is punishing on failure. Y
 	else if (pH <= 7)
 		pH = 7
 	holder.pH = ((holder.pH * holder.total_volume)+(pH * src.volume))/(holder.total_volume + src.volume) //Shouldn't be required Might be..?
+	var/list/seen = viewers(5, get_turf(my_atom))
+	for(var/mob/M in seen)
+		to_chat(M, "<span class='warning'>The beaker froths as the buffer's pH changes!</b></span>")
+	playsound(get_turf(holder), 'modular_citadel/sound/FermiChem/bufferadd.ogg', 50, 1, -1)
 	holder.remove_reagent(src.id, 1000)
 	..()

modular_citadel/code/modules/reagents/objects/items.dm

@@ -9,6 +9,7 @@
     w_class = WEIGHT_CLASS_TINY
     //set flammable somehow
 
+//A little janky with pockets
 /obj/item/pHbooklet/attack_hand(mob/user)
 	if(user.get_held_index_of_item(src))
 		if(numberOfPages >= 1)
@@ -84,3 +85,17 @@
             color = "#c6040c"
     desc += " The paper looks to be around a pH of [round(cont.reagents.pH, 1)]"
     used = TRUE
+
+/obj/item/pHmeter
+    name = "pH meter"
+    desc = "A a electrode attached to a small circuit box that will tell you the pH of a solution. The screen currently displays nothing."
+    icon_state = "pHmeter"
+    icon = 'modular_citadel/icons/obj/FermiChem.dmi'
+    resistance_flags = FLAMMABLE
+    w_class = WEIGHT_CLASS_TINY
+
+/obj/item/pHmeter/afterattack(obj/item/reagent_containers/cont, mob/user, proximity)
+    if(!istype(cont))
+        return
+    to_chat(M, "<span class='notice'><i>gives a beep and displays [round(cont.reagents.pH, 0.1)]</i></span>")
+    desc = "An electrode attached to a small circuit box that will tell you the pH of a solution. The screen currently displays [round(cont.reagents.pH, 0.1)]."

sound/FermiChem/SoundSources.txt

@@ -5,5 +5,6 @@ heatmelt.ogg - 	from https://freesound.org/people/toiletrolltube/sounds/181483/
 heatacid.ogg - 	from https://freesound.org/people/klankbeeld/sounds/233697/
 	        from bubbles2.ogg
 	        from fuse.ogg		
+bufferadd.ogg-  https://freesound.org/people/toiletrolltube/sounds/181483/
 		
 Work is licensed under the Creative Commons and Attribution License.