Gas Alert Micro 4 gas detector, BW Honeywell, needs calibration

Description

This sale is for one gas meter was tested to have powered up but needs calibration and likely one or more of the four sensors is expired. This is the last gas meter I have, and it does not include the battery holder.
These units need to be tested and calibrated every couple of months one or more of the four sensors may require replacement as part of the calibration. All gas meters are subject to this ongoing expense of continuous calibration and up keep. This one is missing the battery compartment.
BW Technologies Gas Alert Micro perfect for OSHA confined space entry compliance
Gas Alert Micro Multi-Gas Monitor by BW Technologies
With all the features you need in a personal gas monitor and weighing just 7.3 oz. (211 g), the rugged Gas Alert Micro is Perfect for OSHA Confined Space Compliance.
The Gas Alert Micro's features and how they benefit you:
High-contrast LCD displays all gases and concentrations simultaneously. No guessing what gas is present.
LOW and HIGH alarms that come preset to OSHA alarm levels.
Also included are TWA (Time Weighted Average) and STEL (Short Term Exposure Limit) alarms that are usually expensive add ons with other monitors. All alarms can also be changed to whatever level the user desires.
High-output 95 decibel audible alarm. No wimpy alarms here. This thing is loud!
Two super bright RED LED alarm bars that get noticed when in alarm
Internal vibrating alarm
Rubberized case is shock absorbing, practically eliminating costly repair bills
Backlight turns on automatically in the dark, or can be turned on at any time by the user
Auto zero's all sensors and automatically calibrates the oxygen sensor on startup
Records and displays TWA, STEL and peak readings
Runs on AA alkaline or NiMH rechargeable batteries. This flexibility ensures that you will never be left with a dead battery and unable to use your monitor.
The runtime for alkaline batteries is 16-18 hours (two work shifts) and rechargeable NiMH is 14-16 hours. Also, there is no need to worry about memory conditions that plague NiCad batteries since NiMH batteries don't suffer from this.
Full function self-test verifies sensor, circuitry, battery integrity, and audible/visual alarms. No more worrying if the instrument is functioning properly or not.
Optional pump available for remote sampling