>> ST-815 (Brand- Senter, Country of origin China) Features:

Hand hole easy to operate
Two to four web length optional
Continuous light, modulated light output
Auto 10minutes shut off function
Support FC, SC, SD adapter
Big LCD, intuitive, easy to use,
LED backlight switch on/off
source close backlight in 8 seconds
Ni-MH rechargeable battery or 9V battery
Battery voltage display

>> OLS-35 (Brand- VIAVI Former JDSU, Country of origin USA) Features:

Rugged & Pocket size design
Large display combined with an easy to use interface
One output port for 2 web length
Tone generator for identifying fiber under test
Micro USB Interface for power supply
Standard 2 AA primary or rechargeable battery operation (up 30 hours)

>> FLS 300 & FLS 600 (Brand- EXFO, Country of origin Canada)