Not much used still has the protective overlay on the display
no calibration cert or instructions
You can download the instructions from the net.
it works great.

info below copied from the net:

Overview

The KEW1052 is a specialist high performance DMM with advanced safety features and comprehensive support for data management.

High Accuracy, High Performance and Reliable Measurements
• 0.09% basic DC accuracy
• Large display with 6,000 counts
• True-RMS Measurements

Safety design for industrial use
• Complies with IEC 61010-1 CAT IV 600V , CAT III 1000V
• Terminal shutter to prevent incorrect test leads’ insertion in current terminals
• Very wide operating temperature range from -10 to 55ºC

Reliable support for data management
• Large data internal memory 1,600 data (logging), 100 data (manual)

Key Benefits

  • True RMS measurements
  • True RMS or MEAN value detection mode can be selected
  • 0.09% basic DC accuracy
  • Terminal shutter to prevent incorrect test leads' insertion in current terminals
  • Very wide operating temperature range from -10 to 55ºC
  • Large data internal memory 1,600 data (logging), 100 data (manual)
  • User calibration function
  • CAT. IV 600V / CAT. III 1000V
  • Complies with IEC61010-1
  • Auto off and backlit display

Key Features

  • True RMS measurements
  • Measures AC/DC current up to 10A
  • Measures AC/DC voltage up to 1000V
  • Temperature measurement ('K' type probe included) -50ºC to 600ºC
  • Auto hold
  • Diode test feature
  • Duty function
  • Capacitance measurement
  • Frequency measurement
  • Continuity buzzer
  • Data hold memory function
  • Resistance measurement
  • Max/Min/Average value
  • Display: 6000 counts