SUNCHE TACHOMETER
Sunche Non-Contact Digital Laser Tachometer, retail $29.95 (www.vxb.com...)
Manufactured by (Unknown)
Last updated 08-11-20
The Sunche Non-Contact Digital Laser Tachometer, model # HS2234 (hereinafter probably just called a tachometer or even a tach) is a small handheld device that allows you to measure the rotational speed (in RPM -- that's Revolutions Per Minute) of many motors, is totally handsfree (so you can maintain a safe distance between you and potentially dangerous moving parts), and has a backlighted display (the backlight can be turned on and off at will) so that you can read the RPM in subdued lighting or even total darkness.
I originally purchased this tach to measure the prop speed of my drones at preflight idle, hover, and maximum thrust.
It does not look brand spanken new in the above photograph because I took this pic almost than a year after receiving it -- the original pic was taken on a POS camera.
SIZE
The tachometer is remarkably easy to use. Just install a pair of AAA cells (see directly below), and THEN you can go see how fast that fan really is. 
Press & release the "POWER" button (it's the lowermost button in the button cluster; silkscreened with a circle that has an | in it).
Aim it at whatever you're measuring the rotation of (apply a small amount of the included reflective tape first if necessary -- such as if the object that you're measuring is a dark color like dark blue or black. For something like measuring the speed of drone propellers, if the drone has white props you'll probably be OK, but if the drone has black props then you'll need to stick a little piece of this tape on one of the props), push and hold the button labelled, "TEST", aim the red laser spot at the bit of reflective tape that you applied, and read the rotational speed directly off the instrument's LCD.
When measuring the speed of white drone props or fan blades, you'll need to divide the displayed value by the number of blades on its propellers in order to obtain true RPM.
To turn the backlight for the LCD screen off or back on, press & release the "POWER" button .
Press & release the "LASER" button to toggle the laser spot to high and low power; use the high power mode when measuring the RPM of something outdoors or indoors under bright light.
The unit turns itself off ~30 seconds after the "TEST" button was last released or any of the buttons were last pressed, so there are no switches to fuss with or forget.
However, you can indeed turn it off immediately by pressing and holding the POWER button for approx. two (2) seconds.
There are several other functions like max hold, record your readings, etc. but I no longer have the instructional materials at my disposal so I'm simply not able to describe how to use them.
To change the AAA cells, turn the unit display-side down (so that the LCD faces the floor). Unclip & remove the battery door, and set it aside.
Remove the tired old AAA cells, and dispose of or recycle them as you see fit.
Install two new AAA cells into the battery chamber, orienting them so that their flat ends (-) negatives face the springs for them in the battery chamber.
Finally, place the battery door back on and press until it snaps into place.
Done with that; fun yeah!
Current usage measures 29.70mA (when taking a measurement; laser in low power mode) and 43.30mA (when taking a measurement; laser in high power mode) on my DMM's 200mA scale
This tachometer is meant to measure the RPM of motors in a dry area; it is not a flashlight meant to be thrashed, trashed, bashed, and abused. So I won't throw it against the wall, stomp on it, pee on it, try to drown it in the toylet bowl or the cistern, run over it, swing it against the concrete floor of a porch, use a medium claw hammer in order to bash it open to check it for candiosity
, fire it from the cannoñata, drop it down the top of Mt. Erupto (I guess I've been watching the TV program "Viva Piñata" too much again - candiosity is usually checked with a laser-type device on a platform with a large readout (located at Piñata Central), with a handheld wand that Langston Lickatoad uses, or with a pack-of-cards-sized device that Fergy Fudgehog uses; the cannoñata (also located at Piñata Central) is only used to shoot piñatas to piñata parties away from picturesque Piñata Island, and Mt. Erupto is an active volcano on Piñata Island {In the episode "Les Saves the Day...Again", Paulie Preztail says "Hey, ever wonder why this park's called 'Mount Erupto' anyway?", then Franklin Fizzlybear says "I think its an old native term. Means 'very safe.'"
}), shoot it into the upper atmosphere of Gamalon V* to make Chairman Songi call the Enterprise so she can get all piddled-off about it, send it to the Daystrom Institute for additional analysis, or inflict upon it punishments that flashlights may have inflicted upon them.
So this section of the web page will be ***SIGNIFICANTLY*** more bare than this section of the web page on a page about a flashlight.
This tach feels great in the hand; there are some anti-slip ridges on the sides (but they won't gouge into your hands) and (like I just said) it feels decent to hold & use.
Beam terminus photograph on a wall at 12".
Power output is 2mW (low) and 4mW (high).
These measurements were made on a LaserBee AX 3.0 Watt Laser Power Meter w/Thermopile with known-good metrics.
Photograph showing the backlighted display.
Spectrographic analysis of the laser in this thermometer.
Same as above; spectrometer's response narrowed to a band between 650nm and 660nm to pinpoint wavelength - which is 654.750nm.
The raw spectrometer data (tab-delimited that can be loaded into Excel) is at tachl.txt
Spectrographic analysis of the LED backlight in this thermometer.
Same as above; spectrometer's response narrowed to a band between 442nm and 452nm to pinpoint native emission peak wavelength - which is 447.650nm.
The raw spectrometer data (tab-delimited that can be loaded into Excel) is at tachd.txt
USB2000 spectrometer graciously donated by P.L.
TEST NOTES:
Test unit was purchased on Ebay on 08-03-19 and was received on the afternoon of 08-14-19.
* From the Star Trek: The Next Generation episode "Final Mission".
UPDATE: 04-02-20
I measured the RPM of the props of my C-Fly DREAM GPS 5G WiFi FPV R/C Drone with this tach; the maximum speed is 10,757RPM.
I measured at least three times "just to be sure it's Westinghouse" as my now-deceased best friend Paul Casey used to say and all three measurements were identical: 10,757RPM.
PROS:
Virtually instantaneous RPM readings
Uses batteries that are common and relatively inexpen$ive
Feels good in the hand when using
Backlight can be turned on and off at will
NEUTRAL:
CONS:
Nothing that I've found thus far
MANUFACTURER: Sunche
PRODUCT TYPE: Noncontact digital tachometer
LAMP TYPE: Diode laser, phosphor white LED display backlight
No. OF LAMPS: At least two (1x laser, 1x white LED)
BEAM TYPE: Very narrow spot
SWITCH TYPE: Pushbuttons for all functions. Auto power-off.
CASE MATERIAL: Plastic
BEZEL: N/A
BATTERY: 2x AAA cells
CURRENT CONSUMPTION: 29.70mA (laser low), 43.30mA (laser high)
WATER-RESISTANT: Very light splatter-resistance at maximum
SUBMERSIBLE: NO WAY HOZAY!!!
ACCESSORIES: Reflective tape
SIZE: 108mm L x 60mm W x 32mm D
WEIGHT: 90g (3.170 oz.) (incl. batteries)
COUNTRY OF ORIGIN: Unknown/not stated -- but probably an Oriental country
WARRANTY: Unknown/not stated
PRODUCT RATING:
Yes folks, that really IS six stars that you see.
Sunche Non-Contact Digital Laser Tachometer * www.vxb.com...
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