Used - Good TSI Q-CHECK

This kit includes a calibrator as well as the meter, probe, custom case and manual. It appears complete and functional. It will require calibration after shipping. There are no issues with damage or display quality. It uses four standard household AA batteries which will be shipped with it.
According to the manual:
Model 8731 Q-CHECK measures CO2 and CO concentrations simultaneously with a single probe.
CO2:
Sensor type: Non-Dispersive Infrared (NDIR)
Range: 0-5000 ppm
Accuracy: ±3% of reading ± 50 ppm at 25°C (add ±0.36% of reading per °C away from calibration temperature (±0.2% of reading per °F))
Resolution: 1 ppm
Response time: 20 seconds (for 63% of final value
for 500 ppm step change in still air)
CO:
Sensor type: Electro-chemical
Range: 0 - 500 ppm
Accuracy: ± 3% of reading or 4 ppm whichever is greater (add ±0.5% of reading per °C away from calibration temp (±0.28% of reading per °F))
Resolution: 1 ppm
Repeatability: ± 2% of reading
Response time: < 60 seconds to 90% of final value
External dimensions: 76 mm x 168 mm x 38 mm // (3.0 in x 6.6 in x 1.5 in)
Probe length: Model 8731: 16.1 cm (6.34 in.)
Probe diameter: 1.9 cm (0.75 in)
Weight: 0.59 kg (1.3 pounds) (with batteries)
Display: 4-digit LCD, 15 mm (0.6 in) digit height
US buyers will pay no added US or Canadian taxes or border related fees. What is paid on checkout is all that will be paid.
Canadian buyers are required to pay 5% GST tax and to make payment in Canadian funds. Shipping will be calculated based on the delivery postal code. Please write for an invoice in CAD.
Buyers in other locations are invited to write for a shipping quote.