High Performance Portable Gas Detectors Test Range: Ppm

We are involved in manufacturing, exporting and supplying Portable Gas Detectors in Mumbai, Maharashtra, India.
Specifications :-
Range: PPM OR V/V
Gas : All Toxic gases OR Oxygen
Display: Digital LCD with Back Light in Increments of 1 PPM/0.1% V/V
Sampling Method: Gaseous Diffusion
Response Time: <90 seconds to 90%
Size: 109X65X25 mm
Weight: 150 grams
Alarms
(82 dB Buzzer@24in,
LED, Back light Vibrator): Operational First Alarm at or above 50 ppm, Second alarm at or above 125 ppm, Third alarm at or above 400 ppm Hourly warning when CO above the 8- hour 25PPM ACGIH TWA
Temperature above 50 C/ 125 F : "HOT" Displayed
Temperature below 0 C/32 F : "COLD" Displayed
Low Battery Warning : "BATT" Displayed
Sensor: Transducer Technology T-Series Electrochemical
Period Of Operation: "12 Hour" and Always On"
Dosimetry
(12 Hour Detection Period Only): Calculate and Records : Maximum Exposure (ppm), Time of Max Exposure (minute since turned on), Total Exposure in ppm / Hours,
8 hour Time Weight
Test: Self-Test on Startup Checks Circuitry, Alarms, Battery and
Operating Temperature. Does not check sensor
Battery Information: Battery Check on Startup and During Operation. User Replaceable CR 2450
Operating Temp: 0-45 C Displayed, Readings Automatically Compensated
Pressure Effects: Reading decreases with Decreasing Pressure, Down 70% at 10,000 fts
Humidity Limits: 15-85 % RH, Non-condensing
Calibration: Recommended at least l x per year, or when ever accuracy of reading is Critical