diff --git a/GainStation13/code/mechanics/fatness.dm b/GainStation13/code/mechanics/fatness.dm
index e275defd..5d6cc33f 100644
--- a/GainStation13/code/mechanics/fatness.dm
+++ b/GainStation13/code/mechanics/fatness.dm
@@ -124,3 +124,25 @@
 	xwg_size = min(xwg_size, RESIZE_HUGE)
 	xwg_size = max(xwg_size, custom_body_size*0.01)
 	resize(xwg_size)
+
+/proc/get_fatness_level_name(fatness_amount)
+	if(fatness_amount < FATNESS_LEVEL_FAT)
+		return "Normal"
+	if(fatness_amount < FATNESS_LEVEL_FATTER)
+		return "Fat"
+	if(fatness_amount < FATNESS_LEVEL_VERYFAT)
+		return "Fatter"
+	if(fatness_amount < FATNESS_LEVEL_OBESE)
+		return "Very Fat"
+	if(fatness_amount < FATNESS_LEVEL_MORBIDLY_OBESE)
+		return "Obese"
+	if(fatness_amount < FATNESS_LEVEL_EXTREMELY_OBESE)
+		return "Morbidly Obese"
+	if(fatness_amount < FATNESS_LEVEL_BARELYMOBILE)
+		return "Extremely Obese"
+	if(fatness_amount < FATNESS_LEVEL_IMMOBILE)
+		return "Barely Mobile"
+	if(fatness_amount < FATNESS_LEVEL_BLOB)
+		return "Immobile"
+
+	return "Blob"
diff --git a/GainStation13/code/modules/research/designs/autolathe.dm b/GainStation13/code/modules/research/designs/autolathe.dm
new file mode 100644
index 00000000..0232b44a
--- /dev/null
+++ b/GainStation13/code/modules/research/designs/autolathe.dm
@@ -0,0 +1,7 @@
+/datum/design/infrared_emitter
+	name = "Fatness Infrared Emitter"
+	id = "fatness_infrared_emitter"
+	build_type = AUTOLATHE
+	materials = list(MAT_METAL = 1000, MAT_GLASS = 500)
+	build_path = /obj/item/assembly/infra/fat
+	category = list("initial", "Misc")
diff --git a/GainStation13/code/obj/items/circuits.dm b/GainStation13/code/obj/items/circuits.dm
new file mode 100644
index 00000000..48d17cc5
--- /dev/null
+++ b/GainStation13/code/obj/items/circuits.dm
@@ -0,0 +1,30 @@
+/obj/item/integrated_circuit/input/fat_scanner
+	name = "integrated body fat analyzer"
+	desc = "A very small version of the common medical analyser adjusted to scan a target's weight."
+	icon_state = "medscan"
+	complexity = 4
+	inputs = list("target" = IC_PINTYPE_REF)
+	outputs = list(
+		"weight (pounds)" = IC_PINTYPE_NUMBER,
+		"weight (BFI)" = IC_PINTYPE_NUMBER
+		)
+	activators = list("scan" = IC_PINTYPE_PULSE_IN, "on scanned" = IC_PINTYPE_PULSE_OUT)
+	spawn_flags = IC_SPAWN_DEFAULT|IC_SPAWN_RESEARCH
+	power_draw_per_use = 40
+
+/obj/item/integrated_circuit/input/fat_scanner/do_work()
+	var/mob/living/carbon/fatty = get_pin_data_as_type(IC_INPUT, 1, /mob/living)
+	if(!istype(fatty)) //Invalid input
+		return
+	if(!fatty.Adjacent(get_turf(src))) // Like normal analysers, it can't be used at range.
+		return
+	
+	var/weight_in_pounds = fatty.calculate_weight_in_pounds() 
+	var/weight_in_fatness = fatty.fatness 
+
+	set_pin_data(IC_OUTPUT, 1, weight_in_pounds)
+	set_pin_data(IC_OUTPUT, 2, weight_in_fatness)
+
+	push_data()
+	activate_pin(2)
+
diff --git a/GainStation13/code/obj/items/sensors/weight_infared.dm b/GainStation13/code/obj/items/sensors/weight_infared.dm
new file mode 100644
index 00000000..b5883cfd
--- /dev/null
+++ b/GainStation13/code/obj/items/sensors/weight_infared.dm
@@ -0,0 +1,79 @@
+/obj/item/assembly/infra/fat
+	name = "fatness infrared emitter"
+	desc = "Emits a visible or invisible beam and is triggered when the beam is interrupted. This one checks if the person tripping it is above or below a certain level of fatness."
+
+	var/fatness_to_trigger = 0
+	var/trigger_below = FALSE
+
+/obj/item/assembly/infra/fat/examine(mob/user)
+	. = ..()
+	. += "<span class='notice'>The infrared trigger is set to trigger when the target is [trigger_below?"above":"below"] being [get_fatness_level_name(fatness_to_trigger)].</span>"
+
+/obj/item/assembly/infra/fat/ui_interact(mob/user)//TODO: change this this to the wire control panel
+	if(!is_secured(user))
+		return
+
+	user.set_machine(src)
+	var/dat = "<TT><B>Fatness Infrared Laser</B></TT>"
+	dat += "<BR><B>Status</B>: [on ? "<A href='?src=[REF(src)];state=0'>On</A>" : "<A href='?src=[REF(src)];state=1'>Off</A>"]"
+	dat += "<BR><B>Visibility</B>: [visible ? "<A href='?src=[REF(src)];visible=0'>Visible</A>" : "<A href='?src=[REF(src)];visible=1'>Invisible</A>"]"
+	dat += "<BR><B>Fatness level to trigger:</B><A href='?src=[REF(src)];fatness_to_trigger=1'>[get_fatness_level_name(fatness_to_trigger)]</A>"
+	dat += "<BR><B>Trigger above or below the target fatness level:</B><A href='?src=[REF(src)];trigger_below=1'>[trigger_below ? "Below" : "Above"]</A>"
+	dat += "<BR><BR><A href='?src=[REF(src)];refresh=1'>Refresh</A>"
+	dat += "<BR><BR><A href='?src=[REF(src)];close=1'>Close</A>"
+	user << browse(dat, "window=infra")
+	onclose(user, "infra")
+	return
+
+/obj/item/assembly/infra/fat/Topic(href, href_list)
+	..()
+	if(href_list["trigger_below"])
+		trigger_below = !(trigger_below)
+		update_icon()
+		refreshBeam()
+	if(href_list["fatness_to_trigger"])
+		var/fatness_type = input(usr,
+			"What level of fatness do you wish to alert above/under at?",
+			src, "None") as null|anything in list(
+			"None", "Fat", "Fatter", "Very Fat", "Obese", "Morbidly Obese", "Extremely Obese", "Barely Mobile", "Immobile", "Blob")
+		if(!fatness_type)
+			return		
+
+		var/fatness_amount = 0	
+		switch(fatness_type)
+			if("Fat")
+				fatness_amount = FATNESS_LEVEL_FAT
+			if("Fatter")
+				fatness_amount = FATNESS_LEVEL_FATTER 
+			if("Very Fat")
+				fatness_amount = FATNESS_LEVEL_VERYFAT
+			if("Obese")
+				fatness_amount = FATNESS_LEVEL_OBESE
+			if("Morbidly Obese")
+				fatness_amount = FATNESS_LEVEL_MORBIDLY_OBESE
+			if("Extremely Obese")
+				fatness_amount = FATNESS_LEVEL_EXTREMELY_OBESE
+			if("Barely Mobile")
+				fatness_amount = FATNESS_LEVEL_BARELYMOBILE
+			if("Immobile")
+				fatness_amount = FATNESS_LEVEL_IMMOBILE
+			if("Blob")
+				fatness_amount = FATNESS_LEVEL_BLOB
+			
+		fatness_to_trigger = fatness_amount	
+		update_icon()
+		refreshBeam()
+
+/obj/item/assembly/infra/fat/trigger_beam(atom/movable/AM, turf/location)
+	var/mob/living/carbon/crossed_fatty = AM
+	if(!istype(crossed_fatty))
+		return FALSE
+
+	if(trigger_below && (crossed_fatty.fatness >= fatness_to_trigger))
+		return FALSE
+
+	if(!trigger_below && (crossed_fatty.fatness < fatness_to_trigger))
+		return FALSE
+
+	return ..() // I love using inheritence so much.
+
diff --git a/GainStation13/code/obj/structure/airlock.dm b/GainStation13/code/obj/structure/airlock.dm
new file mode 100644
index 00000000..54ec3e29
--- /dev/null
+++ b/GainStation13/code/obj/structure/airlock.dm
@@ -0,0 +1,37 @@
+/obj/machinery/door
+	var/fatness_to_check = 0
+
+	var/check_fatness = FALSE
+	var/check_fatness_below = FALSE
+
+/obj/machinery/door/proc/change_fatness_to_check(mob/user)
+	var/fatness_type = input(usr,
+		"What level of fatness do you wish to alert above/under at?",
+		src, "None") as null|anything in list(
+		"None", "Fat", "Fatter", "Very Fat", "Obese", "Morbidly Obese", "Extremely Obese", "Barely Mobile", "Immobile", "Blob")
+	if(!fatness_type)
+		return	FALSE
+
+	var/fatness_amount = 0	
+	switch(fatness_type)
+		if("Fat")
+			fatness_amount = FATNESS_LEVEL_FAT
+		if("Fatter")
+			fatness_amount = FATNESS_LEVEL_FATTER 
+		if("Very Fat")
+			fatness_amount = FATNESS_LEVEL_VERYFAT
+		if("Obese")
+			fatness_amount = FATNESS_LEVEL_OBESE
+		if("Morbidly Obese")
+			fatness_amount = FATNESS_LEVEL_MORBIDLY_OBESE
+		if("Extremely Obese")
+			fatness_amount = FATNESS_LEVEL_EXTREMELY_OBESE
+		if("Barely Mobile")
+			fatness_amount = FATNESS_LEVEL_BARELYMOBILE
+		if("Immobile")
+			fatness_amount = FATNESS_LEVEL_IMMOBILE
+		if("Blob")
+			fatness_amount = FATNESS_LEVEL_BLOB
+		
+	fatness_to_check = fatness_amount	
+	return TRUE
diff --git a/GainStation13/code/obj/structure/scale.dm b/GainStation13/code/obj/structure/scale.dm
index 214f28e6..488d9eda 100644
--- a/GainStation13/code/obj/structure/scale.dm
+++ b/GainStation13/code/obj/structure/scale.dm
@@ -60,6 +60,7 @@
 	else
 		to_chat(fatty, "<span class='notice'>[src.lastreading]Lbs.</span>")
 
+	visible_message("<span class='notice'>The numbers on the screen read out: [fatty] has a BFI of [fatty.fatness].</span>")
 
 /obj/structure/scale/Crossed(AM as mob|obj)
 	if(isturf(loc))
@@ -70,7 +71,11 @@
 				weighperson(HM)
 
 /obj/structure/scale/proc/weighperson(mob/living/carbon/human/fatty)
-	src.lastreading = round((140 + (fatty.fatness*src.fatnessToWeight))*(fatty.size_multiplier**2)*((fatty.dna.features["taur"] != "None") ? 2.5: 1))
+	src.lastreading = fatty.calculate_weight_in_pounds() 
 	weighEffect(fatty)
 	visible_message("<span class='notice'>[fatty] weighs themselves.</span>")
 	visible_message("<span class='notice'>The numbers on the screen settle on: [src.lastreading]Lbs.</span>")
+	visible_message("<span class='notice'>The numbers on the screen read out: [fatty] has a BFI of [fatty.fatness].</span>")
+
+/mob/living/carbon/proc/calculate_weight_in_pounds()
+	return round((140 + (fatness*FATNESS_TO_WEIGHT_RATIO))*(size_multiplier**2)*((dna.features["taur"] != "None") ? 2.5: 1))
diff --git a/code/__DEFINES/misc.dm b/code/__DEFINES/misc.dm
index 8f9ad059..d51813ec 100644
--- a/code/__DEFINES/misc.dm
+++ b/code/__DEFINES/misc.dm
@@ -528,3 +528,5 @@ GLOBAL_LIST_INIT(lighter_reskins, list(ZIPPO_SKIN_PLAIN = "plain", ZIPPO_SKIN_DA
 #define FATTENING_TYPE_MAGIC "magic"
 #define FATTENING_TYPE_VIRUS "virus"
 #define FATTENING_TYPE_WEIGHT_LOSS "weight_loss" 
+
+#define FATNESS_TO_WEIGHT_RATIO 0.25
diff --git a/code/game/machinery/doors/door.dm b/code/game/machinery/doors/door.dm
index 7bf544c4..08e8d0aa 100644
--- a/code/game/machinery/doors/door.dm
+++ b/code/game/machinery/doors/door.dm
@@ -175,6 +175,14 @@
 		return TRUE
 	if(unrestricted_side(M))
 		return TRUE
+	//GS13 EDIT
+	var/mob/living/carbon/human/bump_mob = M
+	if(check_fatness && istype(bump_mob))
+		if(check_fatness_below && (bump_mob.fatness >= fatness_to_check))
+			return FALSE
+		if(!check_fatness_below && (bump_mob.fatness < fatness_to_check))
+			return FALSE
+
 	return ..()
 
 /obj/machinery/door/proc/unrestricted_side(mob/M) //Allows for specific side of airlocks to be unrestrected (IE, can exit maint freely, but need access to enter)
diff --git a/tgstation.dme b/tgstation.dme
index 0bf94521..68d48fea 100644
--- a/tgstation.dme
+++ b/tgstation.dme
@@ -3119,14 +3119,18 @@
 #include "GainStation13\code\modules\reagents\chemistry\recipes\fatdrinks.dm"
 #include "GainStation13\code\modules\reagents\chemistry\recipes\ROCKANDSTONEdrinks.dm"
 #include "GainStation13\code\modules\reagents\reagent_containers\barrel_tank.dm"
+#include "GainStation13\code\modules\research\designs\autolathe.dm"
 #include "GainStation13\code\modules\research\designs\nutri_designs.dm"
 #include "GainStation13\code\modules\research\techweb\nutritech_nodes.dm"
 #include "GainStation13\code\modules\surgery\organs\augments.dm"
 #include "GainStation13\code\modules\vending\gatocola.dm"
 #include "GainStation13\code\modules\vending\mealdor.dm"
 #include "GainStation13\code\obj\items\bluespace_belt.dm"
+#include "GainStation13\code\obj\items\circuits.dm"
 #include "GainStation13\code\obj\items\holy.dm"
 #include "GainStation13\code\obj\items\minor_items.dm"
+#include "GainStation13\code\obj\items\sensors\weight_infared.dm"
+#include "GainStation13\code\obj\structure\airlock.dm"
 #include "GainStation13\code\obj\structure\calorite_doors.dm"
 #include "GainStation13\code\obj\structure\candylight.dm"
 #include "GainStation13\code\obj\structure\fountain.dm"