Description

Spec	Meaning / Importance
Wavelength(s) (e.g. 1310 nm, 1550 nm)	These are the test wavelengths used; standard telecom fibers are commonly measured at these wavelengths
Dynamic range (in dB)	How much loss the device can “see” over distance — higher is better for long fibers
Event dead/blanking zone	The distance after a reflective event where the OTDR cannot detect another event (a “blind” region)
Attenuation (loss) accuracy	How precisely it measures loss (e.g. ±0.2 dB)
Distance accuracy / resolution	Precision with which it can locate faults/splices (often ±(some offset + proportional term))
Pulse width	Different pulse durations allow tradeoff between resolution and measurement range
Connector interfaces / adapters	What types of fiber connectors (FC, SC, LC, etc.) it supports
Display, storage, user interface	Screen size, internal memory, external storage (SD card), software output formats
Battery / power	Battery life, type (Li-ion etc.), charging time
Operating conditions & durability	Temperature range, shock / drop protection, humidity, etc.

What we do know / guess about WL 1000 OTDR

From the reference I found:

The unit is referred to as “WL 1000 OTDR Multi Field Tester” with fiber testing and “advanced field performance.
But unfortunately, that post contains only a general description (not detailed specs).

If “Noval WL-1000” is the same or very similar to “WL 1000”, your unit might have these typical features (as often found in such portable OTDRs):