There are More than 100 Different Meters on the Market

Blood sugar meters were first developed so that emergency responders and ER personnel could figure who was passed from low blood sugar, and who was passed out for other reasons. Today, their use at home is recommended for most people with diabetes. There are hundreds of meters out there (about fifty available in the United States).
I have listed more than a hundred meters and this is not a complete list.

Accu Chek (Roche) makes more than fifteen meters, although it has really different selections in different countries.
Accu Chek Active (made in at least three models, and I think this is the same as the Sensor)
Accu Chek Advantage
Accu Chek Aviva/ Plus (same meter, different strips)
Accu Chek Aviva Compact
Accu Chek Combo
Accu Chek Compact Plus
Accu Chek Aviva Expert (this one will calculate insulin doses for you!)
Accu Chek Aviva Nano
Accu Chek Advantage
Accu Chek Go
Accu Chek Mobile
Accu Chek Performa
Accu Chek Performa Nano
Accu Chek Nano
Accu Chek Voicemate (for blind people)

Advocate meters sells four:
Redi-Code
Redi-Code DASH
Redi-Code Duo
Redi-Code Plus

Arkray makes seven fairly obscure meters:
Assure Platinum
Assure Pro
Assure 4
Glucocard 01(which talks)
Glucocard 01 Mini
Glucocard X
Glucocard Vital


The Bayer line has three basic meters with some variations:
Breeze 2
Bayer Contour
Bayer Contour Link
Bayer Contour Next EZ
Bayer Contour USB
Bayer Contour USB Next
it has also sold
Contour TS
and Bayer Didget, which connects with Nintendo systems

Agamatrix has four meters that it makes solo:
Jazz
Presto
Keynote
Keynote Pro
As well as two that it makes in partnership with Sanofi:
BGStar
iBGStar

Bionime advertises five meters, sold with and without the word "Rightest" in front:
GM100
GM210
GM300
GM550
GM700
But makes a handful more, such as
Pura

Biosense makes the Solo V2 (which not only speaks English and Spanish, but also Mandarin Chinese).

Beurer has a number of meters, which in makes in mg/dl and mmol/l versions. The ones with B measure blood pressure as well as blood sugar:
BGL 40
BGL 60
GL 32
GL 40
GL 44

Broadmaster Biotech makes three versions of the Glucose Shephard. I think one of them tests ketones. They applied for FDA approval (and from one I can tell from the FDA website, they got it) but they don't sell meters here.

Fifty50, the diabetes supply company, also makes its own meter, the Fifty50.

ForaCare sells fourteen blood sugar meters, four of which also test blood pressure:
G20
G30a
G31
G71a
G90
Premium V10
V12
V20
V22
V30a
D10
D15
D20
D30

GlucoCom sells the GlucoCom.

Infopia sells three monitors:
Element
Evolution
Eclipse

Life Scan is selling five meters:
One Touch Verio IQ
One Touch UltraSmart
One Touch Ultra Mini (in lots of colors)
One Touch Ultra 2
One Touch Ultra Link
but has also made
One Touch Select
One Touch Verio
One Touch Verio Pro
One Touch  VITA

Abbott sells five meters:
Freestyle Freedom Lite
Freestye Lite
Freestyle InsuLinx
Precision Xtra
and for hospitals Precision Xtra Pro

Refreshingly enough, Microdot makes nothing but the microdot.

And MyGlucoHealth makes nothing but MyGlucoHealth (and accessories).

Nova Cares just sells two versions of practically the same thing:
Nova Max Plus
Nova Max Link

Nipro sells six that all sound like shoes to me:
True2Go
TrueResult
TrueTrack
TrueBalance
TrueRead
Sidekick

Oak Tree International sells thirteen meters, but only one is FDA approved (they mostly, from what I can tell, sell in Asia):
EMV2
EasyMax15
EasyMaxN
EasyMaxV
EasyMaxT1
EasyMax L
MasterDriver
EasyPlusT2
EasyPlus R2N
GlucoDock
Android APP

Omnis makes two
Embrace
Victory

OKBiotech makes four:
OKmeter Optima
OKmeter Match -this one gives a smiley face for a good reading :- )
OKmeter Link
OKmeter Direct

The Prodigy line has three:
Prodigy Autocode
Prodigy Pocket
Prodigy Voice

Simple Diagnostics sells:
CleverChoice Mini
CleverChoice Pro
CleverChoice Voice
CleverChoice Voice+
CleverChoice AutoCode

Telcare makes the :
Telcare (surprise!)


Walmart's Relion Line includes four meters:
Relion Confirm
Relion Micro
Relion Prime
Relion Ultima

I don't know who makes
Glucoleader Enhance
Glusensor i-Care
Value+
SmartCare
SmartCare Mini