The Light function is used to measure illuminance in the field. It is fully cosine corrected for the angular incidence of light. The light sensitive component used in the meter is a very Stable, long life silicon diode.

The Humidity/Temperature is for use a humidity/semiconductor sensor and K type thermocouple.

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• 4 functions measure Sound level, Light, Humidity and Temperature
• 3 1/2 large LCD display with units of Lux, ºC，％RH and C & dB, A & dB indication.
• Easy to use
• Light measuring levers ranging from 0.01 lux to 20,000 lux.
• Sound level rang
  A LO (low) – Weighting: 35-100 dB  
  A HI (High)- Weighting: 65-130 dB  
  C LO (low) – Weighting: 35-100 dB 
  C HI (High)- Weighting: 65-130 dB 
  Resolution: 0.1 dB 
• Humidity measurement from 25％RH to 95％RH with 0.1％RH resolution and fast time response.
• Temperature measuring levers ranging from – 20.0ºC～＋750ºC/-4ºF～＋1400ºF 

Display: Large 1999 counts LCD display with function of Lux , x10 Lux, ºC, ºF, %RH and dB, A & dB ,C & dB, Lo & dB, Hi & dB, MAX HOLD, DATA HOLD indication.
Polarity: Automatic, (-) negative polarity indication.
Over-range: "OL" mark indication.
Low battery indication: The "BAT" is displayed when the battery voltage drops below the operating level.
Measurement rate: 1.5 times per second, nominal.
Storage temperature: -10ºC to 60ºC(14ºF to 140ºF) at＜ 80％ relative humidity
Auto Power Off: Meter automatically shuts down after approx.10 minutes of inactivity.
Power: One standard 9V, NEDA1604 or 6F22 battery. 

Sound Level Measurement range:：
A LO (low) – Weighting: 35-100 dB  
A HI (High)- Weighting: 65-130 dB  
C LO (low) – Weighting: 35-100 dB  
C HI (High)- Weighting: 65-130 dB 
Resolution: 0.1 dB 
Typical instrument frequency range: 30Hz-10KHz
Frequency Weighting: A, C –weighting
Accuracy: ±3.5 dB at 94 dB sound level, 1KHZ sine wave.

Light Measuring Range: 20, 200, 2000, 20,000lux
(20,000lux range reading x10)
Accuracy: ±5％ rdg ＋10 dgts
Repeatability:±2％.

Humidity/Temperature Measurement Range:
Humidity 25％～95％RH  
Temperature  -20.0ºC~＋50.0ºC    -4ºF~＋122ºF
(K-type)      -20.0ºC~＋200.0ºC   -20ºC~＋750ºC;
-4.0ºF~＋200ºF,     -4ºF~＋1400ºF
Resolution: 0.1％RH, 0.1ºC, 1ºC/0.1ºF, 1ºF.
Humidity: ±5％RH (at 25ºC, 35％～95％RH)
Response time of the humidity sensor: approx. 6min.
Temperature:
±3%rdg±2ºC(at-20.0ºC～+200.0ºC)
±3.5%rdg±2ºC(at-20.0ºC～+750ºC)
±3%rdg±2ºF(at-4.0ºF～ +200.0ºF)
±3.5%rdg±2ºF(at-4ºF～+1400ºF)
Input Protection: 60V dc or 24V ac rms.
Size(HxWxD): 251x63.8X40mm
Weight: 250g